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Specification for Tender
840985535
General Specification for Shopping Malls
Power Distribution
Last update:2017-05-06
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Specification for Tender
840985535
Table of contents :
1
1.1
1.2
2
3
4
4.1
4.2
4.2.1
4.3
4.3.1
5
5.1
5.1.1
5.2
5.2.1
5.3
5.3.1
5.3.2
5.3.3
5.3.4
5.3.5
5.4
5.4.1
6
7
8
9
Project description ...................................................................................................................... 3
Field of activity ............................................................................................................................. 3
Power assessment synthesis .......................................................................................................... 3
General single line diagram ....................................................................................................... 4
List of equipment ........................................................................................................................ 5
MV Distribution .......................................................................................................................... 6
Utility power supply ..................................................................................................................... 6
MV switchboard ........................................................................................................................... 6
General requirements ................................................................................................................... 6
MV/LV Transformer..................................................................................................................... 9
General requirements ................................................................................................................... 9
LV Distribution ......................................................................................................................... 17
Main Low Voltage Switchboard ................................................................................................. 17
General requirements ................................................................................................................. 17
Sub Distribution Switchboard ..................................................................................................... 23
General requirements ................................................................................................................. 23
Final Distribution Switchboards ................................................................................................. 31
Enclosures and installation systems (non-waterproof) .............................................................. 31
Protective devices ....................................................................................................................... 32
Surge arresters ............................................................................................................................ 32
RCCBs ......................................................................................................................................... 33
Circuit breakers protecting final-distribution circuits ............................................................... 34
Distribution busbar trunking system (BTS) ................................................................................ 36
General requirements ................................................................................................................. 36
Power factor correction ............................................................................................................ 46
Uninterruptible power supply ................................................................................................. 46
Standards and locals regulation .............................................................................................. 46
Annexes ...................................................................................................................................... 46
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Specification for Tender
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Project description
1.1 Field of activity
Définition:
Building designed to receive customers with the ultimate purpose of selling equipment and
services to individual composed of several shops with different tenants. It includes:
- supermarket (more than 2 500 m2)
- medium sized department stores (between 500 m2 and 2 500 m2)
- shops (less than 500 m2)
- restaurants and bars,
- movie theater
Surface vary from 10 000m2 to 100 000m2 or even more
Power demand is from 1 MVA to 10 MVA
Description:
Typical example
- Mall 50 000m², one building 4 floors
- 1 large hypermarket (1 MVA), 2 medium sized department stores and specialty stores (0.5MVA
each), 100 shops (0.25MVA)
- 4 MVA power supply.
- Energy consumption: 20 GWh/y
The needs:
The needs are:
- to operate continuously the building with a good continuity of service,
- to provide the right level of comfort to the consumers,
- to ensure the people safety,
- to attract and keep good tenant through a high level of service,
- to reduce operation cost, especially on maintenance and energy expenses,
- to charge tenants on real expenses basis,
- to be able to implement tenant layout changes and extensions with the minimum disturbances on
the mall opening
- to secure the mall delivery
- all this with a “just enough” solution (3 years ROI at the maximum for “above the minimum”
features)
The answers for electrical distribution are:
- electrical distribution architecture oriented to increase continuity of supply especially for
lighting,
- energy monitoring system and sub billing, system which allows simplify on site assembly and
implementation: Busbar Trunking Systems, factory built and standard connection solutions.
1.2 Power assessment synthesis
HVAC
Lighting
PowerSockets
Other
Total Installed power
Last update:2017-05-06
XX kVA
XX kVA
XX kVA
XX kVA
XXX kVA
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General single line diagram
Availability level is provided by:
- MV loop
- Genset + Automatic Transfer Switch for critical
facilities supply
- (UPS for uninterruptible loads)
MV Switchboard
~
~
Hypermarket
Mall critical facilities
(security lighting, escalators,
smoke extraction)
Other mall circuits
(shops, lighting, HVAC)
Ex: HVAC
production
Ex:: HVAC
Ex
shop
distribution
supply
Last update:2017-05-06
Ex: Lighting
Additional availability level and prevention
against damages to electrical installation
provided by surge protection:
- protecting from damage by overvoltage, due to
lightning or to nearby power switchings
- in compliance compliance with standard IEC 61
643-12/TS 61643-12 and with IEC / EN 60364 §5534 and § 4-443.
Flexibility and quick installation is provided by
use of:
- Busbar trunking:
- High power for rising mains
- Medium power for shop supply
- Low power for lighting distribution
Energy cost reduction is provided by:
- Power Factor Correction
- (Load shedding)
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List of equipment
Medium Voltage Switchboard
Name
Architecture
MVSB type 1
Consumer
substation and Ring
substation
MV/LV transformers
Name
Sr
Ur1
(kVA) (kV)
TR type 1
….
….
TR type 2
….
….
Busbar Nb of
Size HxWxD
rating (A) funcionnal unit (mm) per enclosure
….
….
….
Ur2 (V) usc Technology Losses Size HxWxL
(%)
(mm)
….
…. Cast resin
Normal ….
….
…. Oil immersed Normal ….
Main Low Voltage Switchboard
Name
Architecture Busbar Protection
rating degree
(A)
IP-IK
MLVSB type
Change over ….
30 - 08
1
Distribution panels
Name
Architectur Busbar
Protection
e
rating (A) degree
IP-IK
DSWB type
Single
….
30 - 08
1
incomer
DSWB type
Single
….
30 - 08
2
incomer
Distribution Canalis
Name
BTS type 1
BTS type 2
BTS type 3
BTS type 4
BTS type 5
Architecture
Single incomer
Single incomer
Nb of
Size HxWxD
enclosure (mm) per enclosure
….
2000x650x400/600
Nb of
Size HxWxD (mm)
enclosure
….
2000x650x400/600
….
Cumulated length
(m)
….
….
….
….
….
For Low Voltage equipment, in case of no local installation standard, compliance is required
with General IEC 60364.
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Specification for Tender
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840985535
MV Distribution
4.1 Utility power supply
Utility name
…..
Ur (kV)
…..
Psc (MVA)
…..
Upstream connection
Extensible single line
Single line
Ring main
Duplicate supply
4.2 MV switchboard
4.2.1 General requirements
4.2.2 General conditions
The following specifications apply to modular indoor switchboards comprising factory built,
metal-enclosed switchgear assembles.
The equipment to be supplied shall consist of modular cubicles satisfying the following criteria:
- open-ended design,
- easy to install,
- safe and easy to operate,
- compact design,
- low maintenance.
The supplier must be able to prove its extensive possess experience in the field of MV switchgear,
and has already supplied equipment of the same type & production process, in which has been in
operation for at least three years.
4.2.3 Standards
The switchgear shall comply with the latest issues of the following IEC recommendations:
- IEC 62 271-200 Alternative current metal-enclosed switchgear and controlgear for rated
voltages above 1 kV and up to and including 52 kV,
- IEC 60265
High voltage switches for rated voltages of 52 kV and above ,
- IEC 62271-102 High voltage alternative current disconnectors and earthing switches,
- IEC 60694
Common specifications for high voltage switchgear and controlgear standard,
- IEC 62271-105 High Voltage alternative current switch-fuse combinations,
- IEC 62271-100 High Voltage alternative current circuit breakers,
- IEC 60282-1
MV fuses,
- IEC 60185
Current transformers,
- IEC 60186
Voltage transformers,
- IEC 60801
Electromagnetic compatibility for industrial process measurementand control
equipment.
- IEC60529
Degrees of protection provided by enclosures (IP code).
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Specification for Tender
840985535
MV switchboard MVBS type 1 for consumer substation and ring substation
Equipment of type: SM6 24 kV - MV metal enclosed modular cubicles
Environment
- Working temperature from -5°C up to +40°C,
- Installation at an altitude bellow 1000m,
- Average Relative humidity / month: max 90% referring to IEC 62271-200
Electrical characteristics
- Insulation voltage:
- Frequency:
- Required short circuit withstand:
- Nominal current:
Insulation level
50 Hz, 1min (kV)
1.2/50 s (kV peak)
Insulation
Insulation
[7,2 – 12 – 17,5 – 24] kV
[50 - 60] Hz
[12,5 - 16] kA
[400 - 630] A
7,2 kV
20
60
12 kV
28
75
17,5 kV
38
95
24 kV
50
125
Internal arc withstand
12.5 kA. 0.7 s
Standard
16 kA. 1 s
Enhanced
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Specification for Tender
840985535
Switchboard design requirements
Consumer substation
MV/LV substation
Ring main services - MV metering
2 open ring outgoing with Several MV/LV substation
External influences
- Protection index classes: PI (insulating partition)
- Loss of service continuity classes: LSC2A
- Degree of protection units: IP2XC for units, IP2x between compartments
Connections
Cold fitted connection technologies shall be easy to install that favours resistance over time.
Network cables are connected:
- on the switch terminals;
- on the lower fuse holders;
- on the circuit breaker’s connectors.
The cable terminals are:
- square connection round shank for cables > 300 mm2 only.
Lugs must be crimped to cables by stamping.
The end connectors are of cold fitted type wherever possible for better resistance over time.
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Specification for Tender
840985535
The maximum admissible cable cross section:
- 630 mm2 for 1250 A incomer and feeder cables;
- 300 mm2 for 400 - 630 A incomer and feeder cables ;
- 95 mm2 for transformer protection cubicles with fuses.
Access to the compartment is interlocked with the closing of the earthing disconnector.
The reduced cubicle depth makes it easier to connect all phases.
A 12 mm Ø pin integrated with the field distributor enables the cable end lug
to be positioned and attached with one hand. Use a torque wrench set to 50 mN.
Operating mechanism
The operating mechanism shall include a switch and earthing switch position indicator fixed
directly to the shaft of the moving pole, thereby satisfying the positive break criteria.
The front cover of the operating mechanism is suitable for the application of all symbols, mimic
diagrams, nameplates and padlocking fixtures required by the function implemented.
All switch and earthing switch operations shall be carried out with an anti-reflex lever and shall be
independent of the action of the operator after charging the operating mechanism springs.
Auxiliaries
Auxiliary equipment shall satisfy section 5.4 of IEC 62 271-200 recommendations.
The LV cables shall be class 2 type with a 2000 V insulation level.
They shall be marked at each end for easy verification during maintenance or servicing work.
The cable cross-sections shall not be less than 2.5 sqmm for circuits carrying high currents, or 1
sqmm for other circuits.
Interlocks
Mechanical interlocking (padlocking) systems shall be provided to prevent incorrect operations
such as the closing of the earthing switch with the switch or disconnector in closed position.
Surface treatment
The galvanised and electro-galvanised sheet metal and metal fittings shall be painted to provide
protection against corrosion. The epoxy-based paint shall have a thickness of at least 50
micronsmeter and shall be applied to both sides of all sheet metal. The colour shall correspond to
the RAL colour range prop
4.3 MV/LV Transformer
4.3.1 General requirements
These transformers will be in compliance with the following standards:
- IEC 60076-1 to 60076-5: power transformers.
They will be manufactured in accordance with:
- a quality system in conformity with ISO 9001,
- an environmental management system in conformity with ISO 14001, both certified by an
official independent organisation.
A five years guarantee should be possible of dry-type transformers.
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Specification for Tender
4.3.1.1
840985535
Routine tests
These tests will be carried out on all the transformers after the manufacturing, enabling an official
test certificate to be produced for each one:
- applied voltage dielectric test,
- induced voltage dielectric test,
- measurement of no load loss and no load current,
- measurement of windings resistance,
- measurement of impedance voltage and load loss,
- measurement of the transformation ratio and vector group.
4.3.1.2
Type tests and special tests
These tests can be requested as option, but are subject to prior agreement of the supplier:
- temperature rise test,
- lightning impulse test,
- measurement of partial discharges (routine test for Trihal transformer),
- short circuit test (implemented in an approved laboratory)
- noise level measurements.
(All these tests are defined in the IEC 60076-1 to 60076-5 standards)
4.3.1.3
Electrical protection
Protection relay
The installation must have a protection relay to protect the transformer from:
- overload,
- short circuits (internal or external),
- earth faults,
- overflow.
MV surge arresters
It is advisable to check that the installation will not be subjected to overvoltage of any kind
(atmospheric or switching overvoltage).
- If there is a risk, the transformer should be protected by phase-earth surge arresters installed
directly on the MV connection terminals (top or bottom).
Phase-earth surge arresters are absolutely essential in the following cases:
if the lightning impact level Nk is greater than 25. The risk of direct or induced atmospheric
overvoltage is directly proportional to Nk.
- during the occasional switching (less than 10 operations a year) of a transformer with a weak
load, or during a magnetisation period.
They are highly recommended in the following case:
- if the substation is supplied by a network including overhead parts, then a cable which is longer
than 20 m (for example, an overhead-underground network).
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Specification for Tender
840985535
Transformer TR type 1 of type: Trihal cast resin transformer
Environnement
- Altitude: <= 1000m
- Ambient temperature range: -25°C to +40°C
- Average daily temperature: 30°C
- Average annual temperature: 20°C
Electrical requirements
- Rated Power: [160 - 250 - 400 - 630 - 800 - 1000 - 1250 - 1600 - 2000 - 2500 - 3150] kVA
- Insulation voltage: [12 – 17,5 - 24 – 36] kV
- Primary voltage: …… kV
- Secondary voltage: …….V
- Rated impedance voltage: Normal
- Power losses at 120 C°: Normal - Reduced
Operating conditions
- Neutral system: [TNS - TNC - TT - IT]
Metal Enclosure
The transformer will be equipped with a metal enclosure for indoor installation, comprising an
integral IP 31 IK 07 that can be dismantled on request with:
- anti-corrosion protection in the manufacturer's standard painting RAL 9002,
- lifting lugs enabling the transformer and enclosure assembly to be handled,
- a bolted access panel on the enclosure front to allow access to the HV connections and the
tapping.
Accessories and standard equipment
The transformer will be equipped with:
- 4 flat bi-directional rollers,
- lifting lugs,
- haulage holes on the underbase,
- 2 earthing terminals,
- 1 rating plate,
- 1 "Danger Electricity" warning label (T 10 warning),
- 1 routine tests certificate,
- 1 instruction manual for installation, commissioning and maintenance in English.
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Specification for Tender
840985535
MV connection
The MV connections will be made from above on the top of the connection bars. Each bar will be
drilled with a 13 mm hole ready for connection of cable lugs on terminal plates.
The MV connection bars will be in rigid copper bars protected by heat shrinkable tubing.
HV connections in cables are not allowed, in order to avoid all risk of contact, due to cable
flapping.
The MV connections will be in copper.
LV connections
The LV connections will be made from above onto bars located at the top of the coils on the
opposite side to the HV connections.
Connection of the LV neutral will be directly made to the LV terminals between the LV phase
bars.
The LV connection bars will be in copper or in tinned aluminium (as the manufacturer prefers).
The output from each LV winding will comprise a tin-plated aluminium or copper connection
terminal, enabling all connections to be made without using a contact interface (grease, bi-metallic
strip).
These will be assembled according to current practices, notably using spring washers under the
fixings and nuts.
Devices in the 630 to 2500 kVA range will be easy to connect using factory-built electrical
ducting through an optional interface. Stress withstand in the instance of a bolted short circuit on
the connector will be guaranteed by the manufacturer.
MV tapping
The tapping which acts on highest voltage adapting the transformer to the real supply voltage
value, will be off-circuit bolted links.
Tapping with connection cables is not allowed.
These bolted links will be attached to the HV coils.
Thermal protection
The transformer will be equipped with a thermal protection device comprising:
2 sets of 3 PTC sensors, one sensor for "Alarm 1", one for "Alarm 2" per phase, installed in the
coils of the transformer and placed in a tube to enable them to be replaced if necessary,
an electronic converter with two independent monitoring circuits equipped with a changeover
switch, one for "Alarm 1" the other for "Alarm 2" with 3 coloured light indicators to indicate the
position of the relays and the presence of voltage installed on the front of the converter,
a plug-in terminal block for connection of the PTC sensors to the electronic converter.
The PTC sensors will be supplied assembled and wired to the terminal block fixed on the upper
part of the transformer. The converter will be supplied loose with the transformer, packaged
complete with its wiring diagram.
Main construction characteristics
Magnetic core
This will be made from laminations of grain oriented silicon steel, insulated with mineral oxide
and protected against corrosion with a coat of varnish. To reduce power consumption due to
transformer no-load losses, the magnetic core is stacked using overlapping-interlocking
technology, with at least 6 overlaps. To reduce the noise produced by the magnetic core, it is
equipped with noise-damping devices.
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Specification for Tender
840985535
LV windings
The LV winding is produced using aluminium or copper foils (as the manufacturer prefers) in
order to eliminate axial stress during short circuits; this foil will be insulated between each layer
using a heat-reactivated class F pre-impregnated epoxy resin film
The ends of the winding are protected and insulated using a class F insulating material, covered
with heat reactivated epoxy resin
The whole winding assembly will be polymerised throughout by autoclaving for 2 hours at 130°C,
which will ensure:
High level of resistance to industrial environments
Excellent dielectric withstand
Very good resistance to radial stress in the instance of a bolted short circuit.
HV windings
They will be separated from the LV windings to give an air gap between the MV and LV circuits
in order to avoid depositing of dust on the spacers placed in the radical electrical field and to
simplify maintenance.
They will be independent from the LV windings and made of aluminium or copper wire or foil (as
the manufacturer prefers) with class F insulation.
The HV windings will be vacuum cast in a class F fireproof epoxy resin casting system consisting
of:
- an epoxy resin
- an anhydride hardener with a flexibilising additive
- a flame-retardant filler.
The flame-retardant filler will be thoroughly mixed with the resin and hardener. It will be made of
trihydrated alumina powder (or aluminium hydroxide) or other flame-retardant products to be
specified, either mixed with silica or not.
The casting system will be class F. The interior and exterior of the windings will be reinforced
with a combination of glass fibre to ensure thermal shock withstand
MV winding support spacers
These spacers:
- will provide sufficient support in transport, operation and during bolted short circuit conditions
as well as in the case of an earthquake,
- will be circular in shape for easy cleaning and will give an extended tracking line to enhance
dielectric withstand under humid or excessive dust conditions,
- will include an elastomer cushion to absorb expansion according to load conditions and will be
incorporated in the spacer to prevent deterioration by air or UV.
Climatic and environmental classification
The transformer will be of climatic class C2 and of environmental class E2 as defined in IEC
60076-11. C2 and E2 classes will be indicated on the rating plate.
Fire behaviour classification
The transformer will be class F1 as defined in IEC 60076-11. F1 class will be indicated on the
rating plate.
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Specification for Tender
840985535
Additional standards
In addition to general requirements for MV/LV transformers, it will comply with IEC 60076-11,
the dry-type transformer standard and with the following CENELEC Harmonisation Documents:
HD 538-2 S1: 1995 for three-phase dry-type distribution transformers 50 Hz, from 100 to 2500
kVA with highest voltage for equipment not exceeding 24 kV,
IEC 60905: 1987 - Load guide for dry-type power transformers.
Last update:2017-05-06
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Specification for Tender
840985535
Transformer TR type 2 of type: Minera (mineral) oil immersed transformer
Environnement
- Altitude: <= 1000m
- Ambient temperature range:
- Average daily temperature:
- Average annual temperature:
Electrical requirements
- Rated Power:
-25°C to +40°C
30°C
20°C
- Insulation voltage:
- Primary voltage:
- Secondary voltage:
Rated impedance voltage:
Power losses:
[100 – 160 – 250 – 400 – 630 – 800 – 1000 – 1250 – 1600 –
2000 – 2500 – 3150] VA
24 kV
…kV
…V
[Normal – Reduced]
[Normal – Reduced]
Operating conditions
- Neutral system:
[TNS - TT - IT]
Accessories and standard equipment
The transformer will be equipped with:
- 4 bi-directional flat rollers,
- 2 lifting and untanking lugs,
- 2 earthing terminals,
- 1 filling plug,
- 1 draining device,
- 1 rating plate,
- 1 routine test certificate.
MV connection
The standard HV connections will use porcelain bushings on the top of the transformer.
Fixed HV plug-in bushings 24 kV 250A, with HV mobile plug-in bushings - straight or elbow
according to the orientation of the incoming cables - may be provided as an option.
LV connections
The LV connections will be made using porcelain bushings up to 200 kVA, and flat-bars from 250
kVA onwards.
LV porcelain bushings from 250 kVA are also available on request.
A LV air-insulated terminal cover may be provided as an option only with HV plug-in bushings
(incompatible with HV porcelain bushings).
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Specification for Tender
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MV tapping
The tapping which acts on highest voltage adapting the transformer to the real supply voltage
value, will be provided with an off-circuit tap-changer switch with a padlocking facility, as an
option, on the top cover of the transformer.
Thermal protection
The transformer will be equipped optionally with a protection relay, DGPT2 type, (strongly
recommended for powers higher than 400 kVA) including:
1 gas detector/flow level indicator with one contact (for gas discharge and drop in liquid level),
1 over-pressure contact (for internal pressure increase),
1 thermostat with 2 contacts for alarm and tripping (for internal temperature increase),
1 dial type thermometer without contact.
Main construction characteristics
Magnetic core
This will be made from laminations of grain oriented silicon steel, insulated with mineral oxide;
the method of cutting and stacking will be "step lap", so as to optimise the level of no-load losses.
Winding core
MV windings
Al
LV windings
Al
Tank
The tank of the transformer will be:
- made with flexible cooling corrugations, to absorb the expansion of the dielectric due to
temperature variations,
- built in such a way as to avoid water accumulation.
The cover will be bolted on top of the tank.
Dielectric and component material
The dielectric will be mineral oil, class I & II according to IEC 296 and the concentration in PCB
(polychlorobiphenyl) must be lower than the minimum detection rate of 2 ppm (parts per million).
The components of the transformer such as insulation material, varnish, painting, etc. must be new
and PCB-free.
The transformer will be filled under vacuum, in order to guarantee maximum protection of
dielectric properties.
The live part of the transformer will be previously oven dried so as to remove all residual
humidity.
Gaskets
All the gaskets (normally made of elastomer) have to be resistant to the action of the mineral oil,
at working temperature.
Protection against corrosion
The anticorrosion treatment of the tank and the cover will comprise:
- external degreasing and rinsing,
- a hot phosphating operation,
- powdering through application of a polyester resin with an electrostatic spray gun (minimum
thickness 40 to 50 microns),
- final colour green grey RAL 7033.
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Specification for Tender
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- The main characteristics of the coating guarantee:
- a gloss of 30 to 60 % for an angle of 60° (measured according to ASTM-D523),
- a salt spray resistance of 1000 hours (measured according to ASTM-B117),
- a UV resistance without losses more than 10% gloss according to the RAL scale 1 (measured
according to NFT 30-057, over a 3 month period),
- an adherence of between 0 and 1 (measured according to ASTM-D3359).
Additional standards
In addition to general requirements for MV/LV transformers, it will comply with CENELEC
Harmonisation Documents:
- HD 398-1 to 5 for power transformers,
- HD 428-1 S1: 1992 for three-phase oil-immersed type distribution transformers 50 Hz, from 100
to 2500 kVA with highest voltage for equipment not exceeding 24 kV,
- IEC 354 edition dated 1991- Loading Guide for oil-immersed type power transformers.
5
LV Distribution
5.1 Main Low Voltage Switchboard
5.1.1 General requirements
The following paragraph describes the general rules to guarantee the maximum level of quality
and performances for a Low Voltage Switchboard.
In the aim to reach this requirement, the entire equipment must be in appliance according to the
specifications defines in the IEC Standard: 60439-1
The IEC 60439-1 applies to low voltage switchgear and control gear assemblies for a voltage
which does not exceed 1000V in alternative current at frequencies not exceeding 1000 Hz, or for
1500 V in d.c.
This Standard is also applicable for all Assemblies intended for use in connection with the
generation, transmission, distribution and conversion of electric energy, and for the control of
electric energy consuming equipment.
To guarantee the installation consistency during the switchboard life cycle, the installation
systems and the devices must be supplied by the same manufacturer.
5.1.1.1 The Manufacturer Requirements
In order to be conform to the IEC 60439-1, the Switchboard has amongst other things to succeed
Seven tests in the most critical configurations.
Hereafter the detail of those 7 type tests:
No. 1 - temperature rise limits
No. 2 - dielectric properties
No. 3 - short-circuit withstand
No. 4 - protective circuit effectiveness
No. 5 - clearances and creepage distances
No. 6 - mechanical operation
No. 7 - degree of protection
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Specification for Tender
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Thanks to the full achievement of those 7 type tests, the Switchboard exploiters have the insurance
that the equipment properly assembled (according the manufacturers rules) is capable to support
the maximum performances announced by the assembler.
The Switchboard supplier must provide a copy of the first page of theses seven certificates.
5.1.1.2 The Switchboard Assembler requirements
To complete the conformity to the standard, the switchboard assembler has to achieve three others
tests after the complete assembly.
Hereafter the 3 type tests performed by the assembler:
No. 8 - general inspection
No. 9 - insulation / dielectric test
No. 10 - protection measures.
Thanks to the full achievement of those 3 type tests, the Switchboard exploiters have the insurance
that the equipment is conformed to the electrical drawings and to the manufacturer rules.
A copy of these routines tests fully completed by the assembler must be present within or close to
the switchboard on its exploitation site.
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Specification for Tender
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Switchboard MLVSB type 1
Equipment of type: Prisma Plus System P
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
standard
- Average ambient temperature over a period of 24h: 35°C
- Relative humidity:
standard (80% - 35°C)
- Climatic ambience:
standard
Electrical requirements
- Rated Voltage:
- Frequency:
- Rated current:
- Icw:
- Earthing system Main Busbar:
till 1000 V
50 Hz
[630 - 800 - 1000 - 1250 - 1600 - 2000 – 3200] A
85 kA
[TNS – TNC – TT – IT]
Switchboard design requirements
Enclosures:
- Degree of protection IP:
[30 - 31 - 55]
- Degree of mechanical protection IK: [07 - 08 - 10]
- Form:
[2a - 2b - 3a - 3b - 4a - 4b] - For safety reasons and
especially when the door is during switchboard operation, all busbars must be covered by barriers
over the whole perimeter of the busbar zone.
- Painting:
standard RAL 9001
- Door:
with locking (key RONIS n° 405)
In order to facilitate access within the switchboard for maintenance, its covering panels must be
dismountable on all surfaces for all IP degrees.
To ensure maximum protection of people around the electrical installation, front plates must be
installed in front of all control and protection equipment in order to avoid direct access without a
tool to the devices and consequently to the live parts.
Busbars:
- Main busbar rated current: … … A according to the degree of protection IP …
Design will ensure compactness, light weight and enhanced natural convection through the use of
channelled aluminium bars. To ensure a good electrical contact, aluminium will be covered with a
high velocity projected copper, throughout bar height.
In order to limit the volume of copper inside the switchboards for cost and weight reasons, we
strongly recommend designing the electrical architecture with association of horizontal and
vertical busbars.
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Specification for Tender
840985535
The purpose of the horizontal busbar is to supply energy to all vertical busbars
The purpose of the vertical busbar is to distribute energy to all outgoers with a two-fold aim:
1/ If you compare this architecture with horizontal busbars only, you reduce the length of
electrical conductors inside the switchboard by 20%, thus consequently reducing global project
costs.
2/ Second advantage, the assembling quality: as a result of the hz. / vert. architecture, we save
mounting time thanks to upstream connection manufacturing (same length along the cubicle
height
Besides, from the ergonomic point of view, it is better to connect the busbar with the device by
front access. If you really want to improve this asset, we strongly recommend installation of a
vertical busbar with each bar separated in depth and in width from the others.
Protection against overvoltage
Each main low voltage switchboard shall include a type 2 surge protection device, compliant with
EN 61 643-11 (type 2) / IEC 61 643 –1 (class 2 test) / VDE 0675 (class C) standard.
If the building is equipped with a lightning rod, or in any other lightning-attractive situation, ilt
will also include a surge protection device complying with EN 61 643-11 (type 1) / IEC 61 643 –1
(class 1 test) ) / VDE 0675 (class B)
Functional units:
Switchboard architecture: single incomer / changeover / multiple incomers
Incomer(s):
In (A)
Nb
Connect. Withdrawability Switchgear
Type
Quick PRD
PRF1
[250 – 630] A
…
WWW
Plug-in on base
Compact NS
[630 - 1600] A
…
WWW
[1600 - 4000]
A
…
WWW
Withdrawable on
chassis
Withdrawable on
chassis
Masterpact
NT/NW
Masterpact NW
Last update:2017-05-06
Surge
arrester
Lightning
arrester
Circuit
breaker
Circuit
breaker
Circuit
breaker
RCD
No
No
No
- 20 -
Specification for Tender
Feeders:
In (A)
840985535
Nb
Connect. Withdrawability
Switchgear
Type
RCD
[0 – 63] A
…
FFF
Fixed
Multi9 – C60
In TT
[63 – 125] A
…
FFF
Fixed
Multi9 – NG125
[125 – 250] A
…
FFF
Fixed
Compact NS
[250 – 630] A
…
FFF
Fixed
Compact NS
[630 - 1600] A
…
FFF
Fixed
[1600 - 4000]
A
[0 – 63] A
…
FFF
Fixed
Masterpact
NT/NW
Masterpact NW
…
WWW
Plug-in on base
Compact NS
[63 – 125] A
…
WWW
Plug-in on base
Compact NS
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
[125 – 250]
A
[250 – 630]
A
…
WWW
Plug-in on base
Compact NS
In TT
…
WWW
Plug-in on base
Compact NS
Circuit
breaker
Circuit
breaker
[125 – 250] A
…
WWW
Plug-in on base
Compact NS
[250 – 630] A
[630 - 1600] A
[1600 - 4000] A …
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
Circuit
In TT
breaker
…
WWW
Plug-in on base
Compact NS
Circuit
In TT
breaker
…
WWW
Withdrawable on
Masterpact
Circuit
In TT
chassis
NT/NW
breaker
WWW
Withdrawable on chassisMasterpact NW
Circuit breaker In TT
All the devices must be installed on dedicated mounting plates designed for one or more
switchgear of the same type. The aim of this is to group all protection equipment of the same kind
and clearly identify inside the switchboard the function of each device or group of devices.
These mounting plates will have an independent fixing system allowing them to be transformed
and moved anywhere in the switchboard and in particular to facilitate installation upgrading
Estimated Dimensions
Spare capacity: … - The reserve shall not be equipped, as switchboard modular design allows easy
upgrading.
Number of cubicle: …
Dimensions of one cubicle (HxWxD): 2000x650x400/600mm
Maintenance
Due to the continuous changes in electrical needs for buildings and factories, distribution
switchboards must be designed to ensure that they can adapt to these changes.
They thus need to meet the following requirements:
For rapidity and simplicity purposes, the switchboard offer must include dedicated components
allowing addition of one or more wall mounting & floor standing enclosures or cubicles on the
operating site. In order to facilitate current maintenance, e.g. infra red measurement, the device
zone must be accessible in one operation.
End users will be able to obtain some spare parts ten years after discontinuation of the switchboard
offer in order to replace some components for maintenance or upgrading needs.
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Specification for Tender
840985535
For maintenance needs, cubicle extraction and reintegration in the middle of the switchboard must
be possible without operation on the adjacent cubicles
Aesthetics
In order to avoid a dedicated room for low voltage switchboards (main or sub-distribution),
enclosure colour and shapes should be appropriated to be integrated inside all building
environments. This specification reduces facility surface and consequently saves money.
Besides, attractive enclosure aesthetics enable switchboards to be installed in the most accessible
areas of buildings. This feature improves access of the electrical network by reducing maintenance
time, while also ensuring safety thanks to the partitioning and protection degrees
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Specification for Tender
840985535
5.2 Sub Distribution Switchboard
5.2.1 General requirements
The following paragraph describes the general rules to guarantee the maximum level of quality
and performances for a Low Voltage Switchboard.
In the aim to reach this requirement, the entire equipment must be in appliance according to the
specifications defines in the IEC Standard: 60439-1
The IEC 60439-1 applies to low voltage switchgear and control gear assemblies for a voltage
which does not exceed 1000V in alternative current at frequencies not exceeding 1000 Hz, or for
1500 V in d.c.
This Standard is also applicable for all Assemblies intended for use in connection with the
generation, transmission, distribution and conversion of electric energy, and for the control of
electric energy consuming equipment.
To guarantee the installation consistency during the switchboard life cycle, the installation
systems and the devices must be supplied by the same manufacturer.
5.2.1.1
The Manufacturer Requirements
In order to be conform to the IEC 60439-1, the Switchboard has amongst other things to succeed
Seven tests in the most critical configurations.
Hereafter the detail of those 7 type tests:
No. 1 - temperature rise limits
No. 2 - dielectric properties
No. 3 - short-circuit withstand
No. 4 - protective circuit effectiveness
No. 5 - clearances and creepage distances
No. 6 - mechanical operation
No. 7 - degree of protection
Thanks to the full achievement of those 7 type tests, the Switchboard exploiters have the insurance
that the equipment properly assembled (according the manufacturers rules) is capable to support
the maximum performances announced by the assembler.
The Switchboard supplier must provide a copy of the first page of theses seven certificates.
5.2.1.2
The Switchboard Assembler requirements
To complete the conformity to the standard, the switchboard assembler has to achieve three others
tests after the complete assembly.
Hereafter the 3 type tests performed by the assembler:
No. 8 - general inspection
No. 9 - insulation / dielectric test
No. 10 - protection measures.
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Specification for Tender
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Thanks to the full achievement of those 3 type tests, the Switchboard exploiters have the insurance
that the equipment is conformed to the electrical drawings and to the manufacturer rules.
A copy of these routines tests fully completed by the assembler must be present within or close to
the switchboard on its exploitation site.
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Specification for Tender
840985535
Switchboard DSWB type 1
Equipment of type: Prisma Plus System P
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
standard
- Average ambient temperature over a period of 24h: 35°C
- Relative humidity:
standard (80% - 35°C)
- Climatic ambience:
standard
Electrical requirements
- Rated Voltage:
- Frequency:
- Rated current:
- Icw:
- Earthing system Main Busbar:
till 1000 V
50 Hz
[630 - 800 - 1000 - 1250 - 1600 - 2000 – 3200] A
85 kA
[TNS – TNC – TT – IT]
Switchboard design requirements
Enclosures:
- Degree of protection IP:
[30 - 31 - 55]
- Degree of mechanical protection IK: [07 - 08 - 10]
- Form:
[2a - 2b - 3a - 3b - 4a - 4b] - For safety reasons and
especially when the door is during switchboard operation, all
busbars must be covered by barriers over the whole perimeter
of the busbar zone.
- Painting:
standard RAL 9001
- Door:
with locking (key RONIS n° 405)
In order to facilitate access within the switchboard for maintenance, its covering panels must be
dismountable on all surfaces for all IP degrees.
To ensure maximum protection of people around the electrical installation, front plates must be
installed in front of all control and protection equipment in order to avoid direct access without a
tool to the devices and consequently to the live parts.
Busbars:
Main busbar rated current: … … A according to the degree of protection IP …
Design will ensure compactness, light weight and enhanced natural convection through the use of
channelled aluminium bars. To ensure a good electrical contact, aluminium will be covered with a
high velocity projected copper, throughout bar height.
Last update:2017-05-06
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Specification for Tender
840985535
In order to limit the volume of copper inside the switchboards for cost and weight reasons, we
strongly recommend designing the electrical architecture with association of horizontal and
vertical busbars.
The purpose of the horizontal busbar is to supply energy to all vertical busbars
The purpose of the vertical busbar is to distribute energy to all outgoers with a two-fold aim:
1/ If you compare this architecture with horizontal busbars only, you reduce the length of
electrical conductors inside the switchboard by 20%, thus consequently reducing global project
costs.
2/ Second advantage, the assembling quality: as a result of the hz. / vert. architecture, we save
mounting time thanks to upstream connection manufacturing (same length along the cubicle
height
Besides, from the ergonomic point of view, it is better to connect the busbar with the device by
front access. If you really want to improve this asset, we strongly recommend installation of a
vertical busbar with each bar separated in depth and in width from the others.
Functional units:
Switchboard architecture: single incomer / changeover / multiple incomers
Incomer(s):
In (A)
Nb Connect Withdrawability Switchgear
Type
[250 – 630] A
…
WWW
Plug-in on base
Compact NS
[630 - 1600] A
…
WWW
[1600 - 4000] A
…
WWW
Withdrawable on
chassis
Withdrawable on
chassis
Masterpact
NT/NW
Masterpact NW
Circuit
breaker
Circuit
breaker
Circuit
breaker
RCD
No
No
No
Feeders:
Last update:2017-05-06
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Specification for Tender
840985535
In (A)
Nb
Connect. Withdrawability
Switchgear
Type
RCD
[0 – 63] A
…
FFF
Fixed
Multi9 – C60
In TT
[63 – 125] A
…
FFF
Fixed
Multi9 – NG125
[125 – 250] A
…
FFF
Fixed
Compact NS
[250 – 630] A
…
FFF
Fixed
Compact NS
[630 - 1600] A
…
FFF
Fixed
[1600 - 4000] A
…
FFF
Fixed
Masterpact
NT/NW
Masterpact NW
[0 – 63] A
…
WWW
Plug-in on base
Compact NS
[63 – 125] A
…
WWW
Plug-in on base
Compact NS
[125 – 250] A
…
WWW
Plug-in on base
Compact NS
[250 – 630] A
…
WWW
Plug-in on base
Compact NS
[125 – 250] A
…
WWW
Plug-in on base
Compact NS
[250 – 630] A
…
WWW
Plug-in on base
Compact NS
[630 - 1600] A
…
WWW
[1600 - 4000] A
…
WWW
Withdrawable on
chassis
Withdrawable on
chassis
Masterpact
NT/NW
Masterpact NW
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
Circuit
breaker
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
In TT
All the devices must be installed on dedicated mounting plates designed for one or more
switchgear of the same type. The aim of this is to group all protection equipment of the same kind
and clearly identify inside the switchboard the function of each device or group of devices.
These mounting plates will have an independent fixing system allowing them to be transformed
and moved anywhere in the switchboard and in particular to facilitate installation upgrading
Estimated Dimensions
- Spare capacity: … - The reserve shall not be equipped, as switchboard modular design allows
easy upgrading.
- Number of cubicle: …
- Dimensions of one cubicle (HxWxD): 2000x650x400/600mm
Maintenance
Due to the continuous changes in electrical needs for buildings and factories, distribution
switchboards must be designed to ensure that they can adapt to these changes.
They thus need to meet the following requirements:
- For rapidity and simplicity purposes, the switchboard offer must include dedicated components
allowing addition of one or more wall mounting & floor standing enclosures or cubicles on the
operating site. In order to facilitate current maintenance, e.g. infra red measurement, the device
zone must be accessible in one operation.
- End users will be able to obtain some spare parts ten years after discontinuation of the
switchboard offer in order to replace some components for maintenance or upgrading needs.
For maintenance needs, cubicle extraction and reintegration in the middle of the switchboard must
be possible without operation on the adjacent cubicles
Last update:2017-05-06
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Specification for Tender
840985535
Aesthetics
In order to avoid a dedicated room for low voltage switchboards (main or sub-distribution),
enclosure colour and shapes should be appropriated to be integrated inside all building
environments. This specification reduces facility surface and consequently saves money.
Besides, attractive enclosure aesthetics enable switchboards to be installed in the most accessible
areas of buildings. This feature improves access of the electrical network by reducing maintenance
time, while also ensuring safety thanks to the partitioning and protection degrees
Last update:2017-05-06
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Specification for Tender
840985535
Switchboard DSWB type 2
Equipment of type: Prisma Plus System G
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
standard
- Average ambient temperature over a period of 24h: 35°C
- Relative humidity:
standard (80% - 35°C)
- Climatic ambience:
standard
Electrical requirements
- Rated Voltage:
- Frequency:
- Rated current:
- Icw:
- Earthing system Main Busbar:
till 1000 V
50 Hz
[160 - 250 - 400 - 630] A
25 kA
[TNS - TNC - TT – IT]
Switchboard design requirements
The wall-mounting and floor-standing cabinets will be of modular, combinable and upgradeable
structure. They will consist of a rear panel supporting the functional mounting plates and of
panelling elements, quickly removable in order to facilitate site interventions.
Enclosures:
- Degree of protection IP:
…
- Degree of mechanical protection IK: …
- Partioning:
… - For safety reasons and especially when the door is
opened during switchboard operation, all busbars must be
covered by barriers over the whole perimeter of the busbar
zone.
- Painting:
standard RAL 9001
- Door:
with locking (key RONIS n° 405)
The doors will be easily reversible to ensure compatibility with all layouts on the premises.
According to the switchboard environment, they will be plain for maximum protection or
transparent to indicate the switchgear inside.
All necessary configurations will be possible by combining the wall-mounting or floor-fixing
cabinets, whatever the degree of protection. Design will allow total site upgradeability by
assocating new enclosures with the already installed ones.
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Specification for Tender
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Clipped gland plates will allow easy implementation. They can be equipped with suitable devices
in order to maintain the degree of protection. The cables will be connected to specific bar tails or
terminals
Busbars:
Main busbar rated current:
… … A according to the degree of protection IP …
The busbar will be made of rectangular copper bars, quality Cu-ETP R240. It will allow a high
connection capacity and easy installation and modification. It will be protected against direct
contacts IPxxB. The busbar will be supplied by a standardised and tested power supply block
associated with the incoming switchgear.
Functional units:
Switchboard architecture: single incomer / changeover
Incomer(s):
In (A)
Nb
Connect Withdrawability Switchgear
[250 – 630] A
…
FFF
Fixed
Compact NS
Type
RCD
Switch
Yes/No
A standardised incoming connection device, tested in coherence with the whole installation
system and with the switchgear, will allow connection of incoming cables without bending. It will
be protected IPxxB. The assembly incoming connection/incoming switchgear/power supply
block/busbar will form a compact functional unit, completely covered and clearly indicating
power running. Connection of the base at its nominal current shall allow free upgrading of rating
Feeders:
In (A)
Nb
Connect. Withdrawabi Switchgear
Type
RCD
lity
[0 – 63] A
…
FFF
Fixed
Multi9 – C60
[63 – 125] A
…
FFF
Fixed
Multi9 – NG125
[125 – 250] A
…
FFF
Fixed
Compact NS
[250 – 630] A
…
FFF
Fixed
Compact NS
CircuitBreaker
CircuitBreaker
CircuitBreaker
CircuitBreaker
Yes/No
Yes/No
Yes/No
Yes/No
All functional units of the same type and rating shall be interchangeable from the front.
The mounting devices will be equipped with guides and marks for easy positioning of the
switchgear. The devices will be fitted to the mounting plate by screws, and not nuts to avoid nuts
from accidentally falling into the equipment. The switchgear mounting plates will be equipped
with cable fastening tabs.
Estimate Dimensions
Spare capacity:
…%
Aesthetics
In order to avoid a dedicated room for low voltage switchboards, enclosure colour and shapes
should be appropriated to be integrated inside all building environments. This specification
reduces facility surface and consequently saves money.
Besides, attractive enclosure aesthetics enable switchboards to be installed in the most accessible
areas of buildings.
Last update:2017-05-06
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Specification for Tender
840985535
5.3 Final Distribution Switchboards
5.3.1 Enclosures and installation systems (non-waterproof)
All final-distribution enclosures shall be selected from the same range, rated for an incoming
current of up to 160 A. Whatever the installation method (flush or surface mounted), they shall
comply with international standard IEC 60 439-3 / European standard EN 60 439-3 / national
standard …...
The degree of protection, as per IEC 60529, shall be at least:
- IP30 for enclosures without a door,
- IP40 for enclosures with a door.
Enclosures shall provide Class II total insulation (as per IEC / EN 60439-3, section 7.4.3.2)
between outer space and all live components inside.
The impact strength as per IEC 62262 shall be IK08. Large enclosures (24 modules wide) shall be
fitted with metal reinforcements to increase the rigidity of equipped enclosures for shipping,
handling, installation, etc.
For enclosures supplying the following parts of the building:
XXX,
YYY,
ZZZ,
access to devices shall be protected by a door with a two-point closing mechanism guaranteed by
the manufacturer to withstand a pulling force of XX kilograms.
For enclosures supplying
XXX,
YYY
ZZZ
, the door shall be equipped with a closing system locked by a key / triangle tool / square tool /
double-bar tool.
Outgoers will be identified by labels affixed on front of the switchboard, at least 5 cm high,
aligned with each device,. Access to the inside of the enclosure for maintenance purposes shall be
possible row by row, without uncovering any next row.
Common devices such as measurement and indication devices, pushbuttons, emergency off
switches and socket-outlets shall be installed together in the same part of the enclosure and easily
accessible to users. For enclosures equipped with a door, access to the above devices shall be
possible without opening the door.
Cable entry to flush-mount enclosures shall be possible for flexible conduits or insulated cables,
from all four sides and from the rear of the enclosure.
Cable entry to surface-mount enclosures shall be possible from all four sides, for flexible conduits
are cable trunking, or from the rear of the enclosure to facilitate subsequent renovations. For cable
running in the enclosure, clearance between the rails and the back shall be at least 20 mm for
flush-mount enclosures and 35 mm for surface-mount enclosures.
Enclosures shall be equipped with a removable chassis enabling cabling operations on a
workbench, even if the back of the enclosure is already set on the wall. On the chassis, it shall be
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Specification for Tender
840985535
possible to adjust the height of each rail over at least 2 cm. It shall also be possible to adjust the
depth of rails to enable installation of non-modular devices, e.g. moulded-case incoming devices,
intermediate terminals, contactors, isolating transformers, etc.
Chassis installation in the enclosure must be stable and functional even before it is permanently
secured by screws.
Earth and earth/neutral terminal blocks in enclosures shall comply with standard IEC 947-7-1. It
shall be possible to install the earth and earth/neutral terminal blocks and distribution devices
either at the top or bottom of enclosures, near the incoming cables, in the rear or on rails, e.g. near
the RCCBs.
Terminal blocks shall be designed to secure cables in compliance with standards IEC 60947-1,
section 8.2.4, IEC 60998-1 and IEC 60998-2-1. For cable cross-sections up to 6 mm² (rigid or
flexible without ferrules), cable connection shall not require tightening by the installer. Terminalblock extensions, e.g. for installation modifications, must be easy to add and dependable.
The connection between earth and neutral terminal blocks must be rigid and removable only using
a tool.
It must be possible to install flush-mount enclosures without use of mortar. The front panels shall
be perfectly seated, even if the rear part (flush-mount case) is imperfectly set or if the wall is
irregular at the point of installation.
The colour of the enclosures shall be:
- metal-like grey for fronts providing access to devices,
- white for the front-panel frame and wall-mounting part.
It shall be possible for users to personalise doors without risk of touching live parts (nontransparent, transparent, images, wall paper, etc.). When a number of enclosures are installed side
by side, with or without socket-outlets, the overall system must remain aesthetically and
functionally consistent.
5.3.2 Protective devices
Protective devices shall be of the modular type (DIN profile). To maintain the best
cost/performance ratio between continuity of supply and safety, all devices shall be from the same
range and the same manufacturer.
- Main incoming switches, incoming circuit breakers
- Circuit breakers
- RCCBs
- RCBOs
- Surge arresters
5.3.3 Surge arresters
Protection of loads against destruction by lightning shall be implemented in final distribution
switchboards:
A surge arrester complying with IEC 61643-1 (class 2 test) / EN 61643-11 (type 2) must be fitted
where any load is located above 30 meter cable length from the main LV switchboard.
The surge arrester, will limit voltage between earth and any live conductor to never exceed 1.5
kV.
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Specification for Tender
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Its operating voltage Uc will not be lesser than 340 V.
It will be made of withdrawable cartridges, with rated maximum discharge capacity (Imax) 8 kA.
The surge arrester will be set so as to ensure the distance between its earth terminal and the
incoming earth terminal block not to be more than 15 cm.
Surge arrester out of order (missing cartridge, replacement required) will be:
- Automatically disconnected, as per IEC 61643-1 / EN 61643-11, by means of a circuit-breaker,
- Notified by an indicator on front,
- Reported to ….. by means of an indication switch.
Disonnecting circuit-breaker shall be integrated with the surge arrester:
- tripping will not disturb operation nor power off any downstream located load.
- it will be possible to reset it only once all required cartridges have been replaced.
- Coordination with surge arrester, according to § 6.2.7. of above standard, will be certified by the
manufacturer.
5.3.4 RCCBs
RCCBs shall comply with international standard IEC 61008 / European standard EN 61008 /
national standard ….8. Compliance with the standard shall be certified by the XXX organisation
and its identification mark shall be visible on the devices.
For each device, the characteristics shall be indicated on the single-line diagram as per standard
IEC / EN / …. 61008:
- number of poles (section 4.3),
- rated current (section 5.2.2),
- rated residual operating current (section 5.2.3).
The rated making and breaking capacities (sections 5.2.6 and 5.2.7) shall be at least equal to:
- 1.5 kA for fault currents between live conductors (Im),
- 2.5 kA for earth-fault currents (I m).
The rated conditional short-circuit currents (Inc et I c, sections 5.4.2 and 5.4.3) shall be greater
than or equal to the prospective short-circuit current at the point of installation (Isc as per IEC
60364). These values shall be guaranteed by the manufacturer, taking into account the circuit
breaker providing short-circuit protection and the RCCB.
To ensure a highly robust installation, connections between the RCCB and the circuit breakers
located immediately downstream shall be rigid (comb busbars).
RCCBs located upstream of the following loads shall have a reinforced level of performance to
restrict power outages to the strict minimum required for user safety:
- sets of fluorescent lighting, halogen lighting supplied with LV or ELV power,
- groups of PCs and work stations,
- motors driven by single-phase variable-speed drives,
- etc.
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Specification for Tender
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The reinforcement in performance means that the RCCB shall not trip in the following situations:
- continuous 1 kHz leakage current, 8 times higher than the rated tripping threshold (as per IEC
60479-1),
- leakage currents and transient overvoltages due to lightning strikes, switching, decoupling
capacitance discharges, etc.:
- 5 kV peak voltage for a 1.2/50 s wave (IEC/EN 61000-4-5),
- 5 k leakage current for an 8/20 s wave (IEC/EN 61008),
- 400 Â leakage current for a damped sinusoidal 0.5 s / 100 kHz ring wave (IEC/EN 61008),
residual current equal to 5 times the rated residual operating current for a duration less than or
equal to 10 ms,
- very high-frequency inducted or conducted disturbances (starting at 150 kHz).
The RCCBs must trip for fault currents with a DC component (type A as per IEC 60755).
The same is required of residual current devices located downstream of UPSs.
RCCBs protecting three-phase variable-speed drives shall be type B as per IEC 60755.
5.3.5 Circuit breakers protecting final-distribution circuits
Circuit breakers shall comply with international standard IEC 60898 / European standard EN
60898 / national standard …898. Compliance with the standard shall be certified by the XXX
organisation and its identification mark shall be visible on the devices.
For each device, the characteristics shall be indicated on the single-line diagram as per standard
(IEC / EN) 60898:
- number of poles (section 4.1),
- rated current (section 5.2.2),
- breaking capacity (section 5.2.4),
- type according to the instantaneous tripping classification (section 4.5).
If not specified on the diagram, the minimum breaking capacity shall be 6 kA.
All modular circuit breakers shall have the same profile and total height, for all ratings from 1 to
125 A, to ensure optimum installation and connection conditions. They shall also be capable of
receiving the same indication and tripping auxiliaries.
Contact positions shall be clearly indicated on the front of devices and marked:
- "I - ON", standing for device contacts closed, circuit energised,
- "O - OFF" with a green background , standing for device contacts open, circuit disconnected.
Circuit breakers rated up to 32 A shall be the current-limiting type (category 3 as per EN 60898
appendix ZA). For circuit breakers rated 16 to 25 A, the thermal stress during a short-circuit,
dissipated in the concerned circuits shall not exceed:
- 17000 A2s for a prospective short-circuit current of 6 kA rms (400 V three-phase),
- 30000 A2s for a prospective short-circuit current of 10 kA rms (400 V three-phase).
To ensure the longest possible service life, circuit-breaker operating mechanisms shall be designed
to make the contact-closing speed totally independent of the action of the operator.
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The protection system must be capable of heavy-duty operation and to that end, the manufacturer
shall guarantee the following performance levels, defined by IEC / EN 60947-2:
- suitability for isolation (section 7.1.6.1):
- rated insulation voltage (section 4.3.1.2): 500 V
- pollution degree (Part 1, section 6.1.3.2): 3
- rated impulse-withstand voltage (section 4.3.1.3): 6 kV
In compliance with international standard IEC 60364 / national standard ……, section 411.3.3,
subdistribution circuit breakers protecting general-usage socket-outlets with rated current not
exceeding 20 A should provide additional protection against direct contacts. These devices shall
comply with international standard IEC 61009 / European standard EN 61009 / national standard
…1009 and shall have a rated residual operating current of 30 mA.
If the line supplying the switchboard is protected by a circuit-breaker rated 125 A or more, this
one will ensure full discrimination towards any circuit-breaker inside the final distribution
switchboard (ratings up to 63 A).
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5.4 Distribution busbar trunking system (BTS)
5.4.1 General requirements
General
The busbar trunking system shall be of low impedance and sandwiched typed technology. It shall
be totally enclosed prelacquered galvanised steel; suitable for a 3 phases 5 wires system with full
neutral and continuous internal copper earth bar of half size similar to the Scheider Electric
Canalis range.
All busbar trunking fittings (elbow, tees, end Cable Tap Box, etc.) shall be IP55 in accordance to
IEC 529 and from the same manufacturer as the busbar trunking system.
The busbar trunking system shall be capable of being mounted in any position without derating.
Plug-in and feeder sections shall be interchangeable without the use of special adapter joint
covers. The complete installation shall be coordinated throughout and where possible, shall consist
of standard 4m sections with special sections and fittings provided to suit the installation.
Horizontal runs of busbar trunking system shall be supported by hangers at every 3 meters.
Vertical runs of busbar trunking system shall be supported by hangers not more than 4m apart.
Busbar trunking system shall be terminated by ‘end closure’.
Conformity To Standard
It shall be constructed in accordance with the applicable requirements of the latest IEC 60439
Part 1 and Part 2.
Verification of fire barrier in accordance of the latest ISO 834
Resistance to flame propagation conforming IEC 60332 Part 3.
Resistance of the materials to abnormal heat conforming IEC 60695 Part 2.
Environment
The busbar trunking system shall be suitable for continuous operation without derating at an
average ambient temperature of 35o C for 24h (40°C maximum peak)
Short Circuit Capacity
The whole busbar trunking system shall be capable of withstanding the short circuit capacity of
the electrical installation without damaging the electrical, mechanical and thermal stress under
fault condition at a service voltage of 400V 50Hz. Co-ordination of the distribution should be
guarenteed such that the Circuit breaker / trunking combination will limit the peak current to a
value less than the rated peak current of the busbar trunking.
Temperature Rise
The maximum hot-spot temperature rise at any point of the busbar enclosure at continuous rated
load shall not exceed 55o C above the maximum ambient temperature of 35o C in any position.
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Busbar Trunking System BTS type 1
Equipment of type: Canalis KTA - High power rising distribution
Environment
Altitude:
≤ 2000m
Average ambient temperature over a period of 24h: 35°C (40°C maximum peak).
Electrical requirements
Rated Current:
Rated insulation voltage:
Operation voltage:
Frequency:
Conductor organisation:
Icw:
[800 - 1000 - 1250 - 1600 - 2000 - 2500 - 3000 – 4000] A
1000 V
[380 - 400 – 410 – 690] V
50 Hz
[3L+PE - 3L+N+PE - 3L+N+PER]
[35 - 65 - 65 - 85 - 110 - 113 - 113 - 120] kA
BTS composition
Straight length design
Connection joints between two elements of the busway system shall be made of silver-plated
copper only.
Conductors shall be of hard drawn 99.9% purity electrolitic copper. Copper live conductors shall
be insulated by 4 layers of class “B” 130°C halogen free polyester.
Full size neutral of the same cross-sectional area as the phase conductor shall be provided for all
ratings of the busbar trunking system.
Integral continuous internal copper conductor with a cross-section area equal to 50% that of the
corresponding phase conductor shall be provided.
Busbar expansion units shall be used whenever it crosses a building expansion joint or as
recommended by the vendor to reduce stress on the system by differential expansion between the
busbars and the casing, particularly for long busbar runs.
It shall consist of a flexible joint in the middle of the conductors and a sliding casing in 2 sections
which can absorb the relative movements of each section of the length.
All busbar contacts (connection joints or plug-in stabs) shall be of silver plated copper.
The electrical joints shall be of one to four bolt type designed for even distribution of contact
pressure and with inspection covers provided on each side of the joint. They can be dismantled to
facilitate removal or extension.
The joints shall be so designed as to allow removal of any length without interfering with adjacent
lengths.
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Belleville springs shall be provided to give positive pressure over complete contact wear. The
tightening torque shall be 6Nm, and the bolt shall include an external breakable head which breaks
when the correct torque is reached.
The metal enclosure of the busbar trunking system shall be of 1.5mm thick hot dip galvanised
sheet to provide excellent protection and mechanical resistance for phase conductors along the
entire length.
Resistance to corrosion shall satisfy the following tests:
Tropical test:
1000 hours
Marine salt spray:
360 hours
Both vertical and horizontal runs of busbar trunking system shall exhibit a degree of protection
IP55. The enclosure shall be made of four steel sections assembled by clinching.
In order to limit magnetic field around the busway system, aluminium enclosures are not
acceptable.
Tap-off outlets for horizontal and vertical distribution busway shall be able to open and close
automatically when plug-in units are plugged in or removed. When the cover is opened, no live
parts can be accessed and the degree of protection provided shall be at least IP55, with no
additional accessories.
Tap-off unit
Tap-off units shall be supplied by the same manufacturer as the busbar trunking system and shall
be provided with off-load isolators suitable for fuses or circuit breakers according to ratings as
marked in the drawings.
Tap-off units shall also be designed to mount the earth fault relay together with the breaker. Tapoff units shall be of the dust and damp proof version, degree of protection IP55 with silver plated
contacts suitable for all busbar ratings, and shall be suitably earthed.
The earthing contact of the tap-off unit shall always be made before that of the live conductors and
be the last to break during removal.
The tap-off unit and the busbar trunking system shall be interlocked to ensure that the device is in
the ‘OFF’ position prior to installation or removal of the unit.
The tap-off unit shall have an interlock preventing the cover from being opened while the device
is in the ‘ON’ position and preventing accidental closing of the device when the cover is opened.
Embedded switchgear
All circuit breakers used shall be able to operate normally when mounted upside down or at any
angle.
The MCCB used in the tap-off unit must conform to IEC 947-2. All MCCBs shall have a rated
service breaking capacity (Ics) of RMS value at 400VAC equal to or greater than the prospective
fault level of installation. It shall have current limiting capabilities to protect the busbar trunking
system and a co-ordination table shall be supplied by the manufacturer.
In (A)
Switchgear
Type
[0 – 100] A
Multi9
Circuit breaker
[100 – 630] A
Compact NS
Circuit breaker
[800 – 1250] A
Compact NS
Circuit breaker
End feed unit type
It shall be possible to implement the end feed unit at the center or at the far end of the busbar
trunking system.
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External influence requirements
- Degree of protection IP: 55
- Degree of mechanical protection IK: 08
- Painting: standard RAL 9001
- Sprinkler proof
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Busbar Trunking System: BTS Type 2
Equipment of type: Canalis KTA - Distribution board-transformer connection
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Busbar Trunking System: BTS Type 3
Equipment of type: Canalis KSA - Medium power rising distribution
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
standard
- Average ambient temperature over a period of 24h: 35°C
- Relative humidity:
standard (80% - 35°C)
- Climatic ambience:
standard
Electrical requirements
- Rated Current:
- Rated insulation voltage:
- Operation voltage:
- Frequency:
- Conductor organisation:
- Icw:
[100 - 160 - 250 - 400 - 500 - 630 - 800 - 1000] A
690 V
[380 - 400 – 410 – 690] V
50 Hz
3L+N+PE
[2,6 - 4,45 - 10 - 18,8 - 26,2 - 32,1 - 37,4 - 37,4] kA
BTS composition
Straight length design
- Enclosure will be made of sheet steel, galvanised and prelacquered RAL 9001.
- 4 conductors will be fitted with bimetal silver-plated copper/ aluminium laminate riders,
electrically welded at junctions and tap-off outlet positions.
- Junction block will be equipped with flexible contacts for the mechanical junction between two
components to manage the difference in expansion between the conductors and the enclosure
- Tap-off outlets will be placed every 0.5 or 1 metre on one side of the trunking. Tap-off outlets
will be equipped with automatic shutters to avoid accidental contact with live parts.
- The junction block will be maintenance free.
Fixing bracket design
- The fixing brackets are designed for suspension or fixing to a wall every 3 metres (unless
otherwise specified)
- Spring mechanisms will be provided to adjust the length of the threaded rod quickly and without
tool (no rod or nuts)
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Tap-off unit
- Tap off unit jaws will be made of silver plated copper contacts suitable for all busbar ratings
- the contact of the protective conductor will ensure automatic opening of the shutters first
- there will be no access to live parts when the cover of the tap-off unit is open (wire 1 mm in
diameter, IPxxD),
- Connection and disconnection will be impossible with the cover closed
- It is not possible to close the cover before the tap-off unit is mechanically locked on the trunking
Embedded switchgear
In (A)
Switchgear
Type
[0 – 100] A
Multi9
Circuit breaker
[100 – 400] A
Compact NS
Circuit breaker
End feed unit type
It shall be possible to implement the end feed unit at the center or at the far end of the busbar
trunking system.
External influence requirements
- Degree of protection IP:
55
- Degree of mechanical protection IK: 08
- Painting:
standard RAL 9001
- Sprinkler proof
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Busbar Trunking System: BTS Type 4
Equipment of type: Canalis KSA - Medium power distribution
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
standard
- Average ambient temperature over a period of 24h: 35°C
- Relative humidity:
standard (80% - 35°C)
- Climatic ambience:
standard
Electrical requirements
- Rated Current:
- Rated insulation voltage:
- Operation voltage:
- Frequency:
- Conductor organisation:
- Icw:
[100 - 160 - 250 - 400 - 500 - 630 - 800 - 1000] A
690 V
[380 - 400 – 410 – 690] V
50 Hz
3L+N+PE
[2,6 - 4,45 - 10 - 18,8 - 26,2 - 32,1 - 37,4 - 37,4] kA
BTS composition
Straight length design
- Enclosure will be made of sheet steel, galvanised and prelacquered RAL 9001.
- 4 conductors will be fitted with bimetal silver-plated copper/ aluminium laminate riders,
electrically welded at junctions and tap-off outlet positions.
- Junction block will be equipped with flexible contacts for the mechanical junction between two
components to manage the difference in expansion between the conductors and the enclosure
- Tap-off outlets will be placed every 0.5 or 1 metre on one side of the trunking. Tap-off outlets
will be equipped with automatic shutters to avoid accidental contact with live parts.
- The junction block will be maintenance free.
Fixing bracket design
- The fixing brackets are designed for suspension or fixing to a wall every 3 metres (unless
otherwise specified)
- Spring mechanisms will be provided to adjust the length of the threaded rod quickly and without
tool (no rod or nuts)
Tap-off unit
- Tap off unit jaws will be made of silver plated copper contacts suitable for all busbar ratings
- the contact of the protective conductor will ensure automatic opening of the shutters first
- there will be no access to live parts when the cover of the tap-off unit is open (wire 1 mm in
diameter, IPxxD),
- Connection and disconnection will be impossible with the cover closed
- It is not possible to close the cover before the tap-off unit is mechanically locked on the trunking
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Specification for Tender
Embedded switchgear
In (A)
Switchgear
840985535
Type
[0 – 100] A
Multi9
Circuit breaker
[100 – 400] A
Compact NS
Circuit breaker
End feed unit type
It shall be possible to implement the end feed unit at the center or at the far end of the busbar
trunking system.
External influence requirements
- Degree of protection IP:
55
- Degree of mechanical protection IK: 08
- Painting:
standard RAL 9001
- Sprinkler proof
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Busbar Trunking System: BTS Type 5
Equipment of type: Canalis KDP - Low power flexible busbar trunking system
Environment
- Altitude:
≤ 2000m
- Ambient temperature:
35°C in any position
- Maximum hot-spot temperature rise at any point of the busbar at continuous rated load: ≤ 55°C
Electrical requirements
- Rated Current:
- Rated insulation voltage:
- Conductor organisation:
- Icw:
20 A
690 V
[1L+N+PE - 3L+N+PE]
0,34 kA
BTS composition
Conductors
Conductors shall be made of 3 or 5 tin-plated copper on the whole length, to ensure reliable and
better contacts, including one separate protective conductor
The insulation shall be double: each conductor shall be insulated and the whole of the conductors
shall be protected by an insulating sheathing.
Plug in openings
Plug-in openings shall be factory fitted, (at regular intervals of 1,2 m, 1,35 m, 1,5m, 2,4m, 2,7m or
3m)
After the dismantling of a tap-off unit, the IP55 shall be restored by installing the blanking plate
initially factory fitted.
Plus in connectors
The busbar bar trunking system shall derive the electrical power by means of a range of plug-in
connectors, compatible with all the ranges of busbar trunkings, from 20 to 40A, of the same
manufacturer.
The plug-in connectors can be connected and disconnected while energised and under live
conditions.
No live part can be accessed at any time, before, during and after the plugging.
For a better safety, during the connection of the plug-in connectors, the PE connection shall occur
prior to the connection of the phases and the neutral.
Phase selection plug-in connectors shall be available, to balance 3-phase distribution systems; the
selection shall be visible via a transparent window.
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Among the range of plug-in connectors, 10A units, ensuring both the supply and the control of
the lighting, with following options, shall be available:
- control by single-circuit switch,
- control by double-circuit switch,
- control by two-way switch,
- control by impulse switch or timer.
The quality of the live contacts between the busbar trunking and the plug-in connectors shall be
ensured by means of a spring clamp system.
Fixing system
A support ensuring the mounting of both the busbar trunking and VDI cables, shall be available.
External influences requirements
- Degree of protection IP:
55 in any positions, in accordance with IEC 60529.
- Degree of mechanical protection IK: 07
- Sprinkler tested, with no need of additional accessories.
6
Power factor correction
7
Uninterruptible power supply
8
Standards and locals regulation
9
Annexes
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