Download Annex I.B.2 B - Electrical plant specifications

ANNEX I.B.2 B
ELECTRICAL PLANT SPECIFICATION
JOINT RESEARCH CENTRE
ISPRA SITE MANAGEMENT
Maintenance and Utilities Unit
Construction and maintenance of a new Data Centre for the Joint Research Centre
Site of Ispra
EUROPEAN COMMISSION
JOINT RESEARCH CENTRE
ISPRA SITE MANAGEMENT
1. Generality
Any electrical plant must be executed according to existing laws and relevant
technical norms, taking in due account environmental and operational conditions.
Any plant will have its own independent connection boxes and piping and
ducts network. Cables will be installed in metal trays or pipes; only lighting pipes,
where environmental condition will allow it, can be installed in PVC rigid pipes. All
trays and pipes will follow paths to be kept parallel/perpendicular to existing
walls/structures. Fixing and fastening of cable trays and pipes must ensure stability
and crushproof. Flexible connections shall be installed where thermal dilatation could
cause troubles. Suitable distances must be kept from high temperature/high pressure
installations. Any empty pipe must be provided with a driving thread for further use.
All following prescriptions, referred to materials and norms cannot be
considered as exhaustive; all relevant codes and norms must be kept in
consideration both during the design and in the construction phase. In general all
relevant best practices must be applied.
2. Cables
a) Denomination N07V-K
Relevant specific technical norms:
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Construction – requirements: CEI 20-11, tables CEI-UNEL 35752
Fire propagation: CEI 20-22 Il
Flame propagation: CEI EN 50265-2-1
Corrosive and halogenic gases: CEI-EN 50267-2-1
Technical data:
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Nominal voltage: 450/750V
Testing voltage: 2500 V in c.a.
Operation temperature max: 70°C
Short circuit temperature max:160°C
Lowest installation/handling temperature: 5°C
Highest operation temperature in installations at risk of fire: 55°C
Conductor: flexible copper thread
Insulation: special double layer PVC
Radius of curvature: > 4 times cable's diameter
Maximum tractive strain: 5 kg./mm2 of copper section
Characteristic – operational mode :
• Within external or recessed pipes, in closed systems. For voltage up to 1000 V in
a.c. or up to 750 V respect to ground in d.c.; smooth-driving through pipes, good
and flexibility, resistance to scraping, very good ease to skin
• Permanent installation within light sources or signalling/switching devices
b) Denomination (R)FG7R/4 – (R)FG7OR/4
Relevant specific technical norms:
• Construction – requirements: tables CEI 20-20/13, IEC 60502-1, CEI-UNEL
35375
• Fire propagation: CEI 20-22 Il
• Flame propagation: CEI EN 50265-2-1
• Corrosive and halogenic gases: CEI-EN 50267-2-1
• Low corrosive gases emission: CEI 20-37 I
Technical data:
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Nominal voltage: 0,6/1 kV
Testing voltage: 4000 V in c.a.
Operation temperature max: 90°C
Short circuit temperature max: 250°C
Lowest installation/handling temperature: 0°C
Conductor: flexible rope copper class 5 (per FG7R/4 e FG7OR/4); copper single
thread class 1 (RG7R/4 e RG7OR/4 sect. < 6 mmq.); copper rigid rope class 2
(RG7R/4 e RG7OR/4 sect. ≥ 10 mmq.)
Insulation: EPR rubber type G7
Filling: termoplastic, penetrating among component cables (for multipolar cables)
Coating: PVC quality Rz
Color: grey
Radius of curvature: > 4 times cable's diameter (FG7), > 6 times cable's diameter
(RG7)
Maximum tractive strain: 5 kg./mm2 of copper section (permanent installations)
Characteristic – operational mode :
• Good resistance to industrial oils and greases. Good behaviour at low
temperatures. Suitable for power distributions for industrial/residential
applications, construction sites. Permanent installation in pipes, underground
cable ducts, trays.
3. Cables pipes and ducts
a) Rigid PVC pipes, series RKB
Relevant specific technical norms:
• Construction – requirements: CEI 23-39, 23-54, 23-80, 23-81
• Tables UNEL 37118 (pipes) 37119 e 37120 (accessories)
Technical data:
• Material: PVC
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Color: RAL grey 7035
Resistance to compression: 1250 N
Resistance to impact: 2 kg. from 100 mm. (2 J)
Handling, installation, environmental limit temperatures: -5 °C/60 °C
Insulation resistance: higher than 100 MΩ at 500 V for 1 minute
Dielectric rigidity higher than 2 kV at 50 Hz for 15 minutes
Resistance to flame propagation: self-extinguishing in less than 30 seconds
Characteristic – operational mode :
• Electrical/data plants in ordinary or particular environments; wall/ceiling external
installation, within false ceilings or raise floors; recessed in floors, walls, ceilings
b) Hot galvanized steel pipe – type conduit (UNI 7863)
Hot galvanized inside and outside steel pipes, non-welded, bent using a
suitable bending machine, with threaded connections, to achieve a water proof, type
"Conduit "(UNI 7683).
Technical data:
• Material: FE360 steel, Hot galvanized inside and outside UNI 5745
Characteristic – operational mode :
• Recommended for environment where mechanical impacts can occur; due to
presence of heavy machinery or load handling to protect cables. Pipe finishing
must ensure the total absence of burrings which could damage cables' insulation.
Fixings must be compatible with the environment and operational conditions.
Electrical continuity must be ensured, also through connection boxes.
4. Cable trays
4.1.
Metal trays
Relevant specific technical norms:
• Construction – requirements: CEI 7-6 (hot galvanisation), 23-31 (metal trays
systems), 23-76 (EN 61537 – cable trays)
Characteristic – operational mode :
• Metal trays are used to install main power cables, and to install a great number of
cables, so that piping would be unsuitable (typical case, a structured cabling
plant); they are usually used in false ceilings, underground passages, industrial
environment, with double-insulated cables. The kind of galvanisation is to be
chosen depending on environmental conditions. The choice of the kind of trays
must be based on the plant actual needs. If hosting cables working at different
nominal voltages, suitable barriers among them must be provided; electrical
continuity must be also ensured.
a) Sendzimir zinc-coated cable trays
To be used for inside installation; thickness 15/10 mm. up to 250 mm. width
and 20/10 mm. up to 500 mm. width; maximum width shall be 500 mm. Connection
must ensure that cable insulation can be scraped during installation. Brackets must
be galvanised in the same way as trays. Fixings and fastenings will be executed
according to environmental and load conditions. Whenever a thermal dissipation is
needed, a perforated tray must be chosen. The number and the size of cables must
ensure that the trays are not overloaded. For any change in direction/height and for
derivation or entrance (in switchboard) suitable accessories must be used.
When crossing fire-proof cellars/walls, suitable firebreak barriers must be
installed, to preserve level of fire prevention.
b) Galvanised steel thread-tray
When hosting a big number of cables, having the need of several
entrances/exits of cables through the tray, a galvanised steel thread-tray can be
used. Accessories for direction/height changes are not required, but the finishing
must ensure that cables' insulation will not be damaged by possible burrings.
Connections and supports must ensure stability according to expectable loads.
5. Light fixtures
a) Light fixtures for internal use
All light fixtures must be delivered in operation and complete with all
accessories.
Relevant specific technical norms:
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CEI 34-3 and variations, for fluorescent lamps
CEI 34-21, CEI 34-23 for light fixtures
CEI 34-22 – EN 60598-2-22, CEI 34-111, CEI 34-117 for emergency lighting
CEI EN 60285: for rechargeable nickel-cadmium batteries
Characteristic – operational mode :
Water and dust protection of the light fixtures must be adequate to
environmental agents and conditions. Quality and construction standards must be of
the best quality available on market, with special regard to resilence, ossidation
prevention, and to reflection characteristics of the surfaces. They must be flameresistant; the rephasement of the lamps must be present. Feeding voltage must be
230 V – 50 Hz, the fixture will have the ground connection available on the body and
therefore connected to the grounding plant. Internal cabling must be done with cables
resistant up to 105 °C, with a section of at least 1 mm2. Connection shall be executed
by insulated terminal connections.
Fastening must be executed by screws, avoiding rivets or clips. Gaskets must
be resistant to ageing.
b) Emergency light fixtures
All light fixtures must be delivered in operation and complete with all
accessories. Emergency lighting, as well as lighting of exodus paths, can be
executed by:
• Battery-powered light fixtures
• Lighting fixtures with centralised power supply (connected to the UPS)
Light fixtures must comply to EN 60598-2-22. Lighting must be kept for at least
1 hour after power switch down.
6. Switchboards - switchgears
a) Electrical switchboards
Electrical switchboard will be metal framed, ground based. The structure and
the enclosure will be adequate to environmental conditions and to electrical loads. It
will include, in addition to normal components of the structure and the enclosure:
• Equipotential connection and grounding
• Copper round-edged bars, with resin-polyester supports
• Connection terminals for outgoing cables and for internal distribution cabling
• Connection terminals for auxiliary circuits
• Internal cabling, identifiers, PVC trays
• Metal framed base
• Cristal front door, with keylock
• Internal folder including single-wiring schemes
• Test reports and conformity declarations referred to CEI EN norms requirements
• Switchboard identification plate according to CEI EN norms
• Switchgears internal identifiers
Service switchboards in polyester – fiberglass can be supplied.
Water and dust protection of the switchboards must be adequate to
environmental agents and conditions. Structure, bars and bar fixing must be
adequate for the actual short circuit conditions. Every main power switchboard will be
equipped with energy/voltage/current metering, to be made available to an external
data collection system. Cabling of switchboards must be done with N07V-k cables at
section to be defined according to load conditions and switchgear protection
characteristics. Equipotentialisation wires will be connected to internal copper bars.
Switchboard will guarantee a 30% spare of bars capacity and of internal space, to
host future possible devices.
All ground connection will be done using yellow-green wires at section
according to CEI EN norms, using eyebolt connection terminals. Any wire must be
identifiable through numbered clamps.
The supply of a switchboard will be considered complete when the Contractor
will have provided:
• Conformity declaration (EN 61439-2)
• Single-wire schemes
• Test certificate, according to CEI EN norms
• Thermal calculations
b) Breakers
Any power circuit connected to an electrical switchboard, or to a busbar, or fed
through a plug, having an absorbed power higher than 1000 VA will be protected by
overcurrents. The breakers connected to the busbars will be equipped with toroidal
sensors to detect ground currents and with opening coils, whose activation criterium
will be decided in a further moment. The grounding system will be connected to the
campus ground network, and sized accordingly. Data about ground resistance of
campus ground network will be given to the contractor if and when required. The
main switchboard (parallel switchboard from transformers and Gen-set) is out of the
scope of the works. The protection will interrupt power circuits both in case of short
circuits and in case of overload, and can be included in the same device or can be
split (for instance, fuses and indirect relais). All active phases and the neutral must be
protected; the breaker must interrupt also the neutral conductor. Automatic breakers
will be of the fast opening type.
Limitation class for modular breakers must be “3” according to norm EN
60898. The protection against direct contact must be ensured within the switchboard.
Protections must be coordinated as indicated in CEI norm 64-8. Coordination
between failure current and opening tome of the breaker must be ensured according
to CEI norm 64-8.
In any case 1. Protection against direct contacts 2. Protection against indirect
contacts 3. Protection against overload currents 4. Protection against short circuits 5.
Differential protections 6. Protection coordination.
A back-up protection, where an upstream breaker will be delegated to interrupt
short circuit currents instead of the downstream breaker, will not be permitted. Any
cable section must be coordinated with the passing-through energy in all load and
failure conditions. The type of differential breakers must comply with the kind of the
electrcal load.
Relevant specific technical norms:
• CEI 17-13/4 – EN 60439-4: "Apparecchiature assiemate di protezione e manovra
per bassa tensione – Prescrizioni particolari per apparecchiature assiemate per
cantiere (ASC) "
• CEI EN 61439-1 (CEI 17-113) Apparecchiature assiemate di protezione e di
manovra per bassa tensione (quadri BT) - Parte 1: Regole generali
• CEI EN 61439-2 (CEI 17-114) Apparecchiature assiemate di protezione e di
manovra per bassa tensione (quadri BT) - Parte 2: Quadri di potenza
7. Busbars
See document Annex I.B.2A, technical specification, file n. 262500; reference
to European norms must be taken into account.
8. Grounding
See document Annex I.B.2A, technical specification, file n. 260526; reference
to European norms must be taken into account. The existing distribution system in
the JRC is TN-S (common earthing and neutral connection to ground – separate
wires distributing earthing and neutral).
All the following wires must be connected to the ground collector:
• Grounding wires
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Protection wires
Equipotential wires
Earth wires
All metal structures
9. Compulsory technical documentation – Conformity
Declaration ex Decr. Min. Svil. Econ. 37/2008
i) Final documentation
The electrical plants fall under the obligations stated in D.M. 37/2008, art. 5
point 2. The Contractor will deliver the execution design of the electrical plant as for
the Annex I.A; at the end of the works the final drawings (as built), both on paper
(signed by a licensed engineer) and in electronic format (AutoCAD ® .dwg and
Adobe ® pdf for plans, views and drawings, Microsoft office ® or similar .doc and.xls
for technical documents, calculations and tables).
Testings on the electrical plants will include, apart of the test plan:
• Insulation resistance test on circuits
• Differential breakers tests; toroidal ground current revealer alarm test
• Continuity of ground wirings
• Test of electrical switchboards defined by norms
• UPS tests
ii) Conformity declaration
At the end of the works, the Contractor will deliver conformity declaration,
together with the compulsory annexes required by law :
• as built documents
• Description of the materials installed in the plants
• Conformity and test declaration for switchboards
• Chamber of commerce certificate, showing, if required, the authorisation of the
company to install electrical plants