Download Technical specification for tender Schneider

Technical specification for tender
Medium Power Busbar Trunking System
Specifications
Distribution Application from 100A to 1000A
Last update :30-04-17
582730219
Technical specification for tender
582730219
Table of contents:
1.
GENERAL................................................................................................................................................................................. 3
2.
CONFORMITY TO STANDARD .......................................................................................................................................... 3
3.
ENVIRONMENT ..................................................................................................................................................................... 3
4.
CONDUCTORS ........................................................................................................................................................................ 3
5.
PROTECTIVE CONDUCTOR ............................................................................................................................................... 4
6.
SHORT CIRCUIT CAPACITY .............................................................................................................................................. 4
7.
TEMPERATURE RISE ........................................................................................................................................................... 4
8.
JOINTS ...................................................................................................................................................................................... 4
9.
ENCLOSURE ........................................................................................................................................................................... 4
10. TAP-OFF OUTLETS ............................................................................................................................................................... 4
11. TAP-OFF UNIT ........................................................................................................................................................................ 4
Last update :30-04-17
Technical specification for tender
1.
582730219
General
The busbar trunking system shall be of low impedance and air insulated typed technology. It shall be totally enclosed
galvanised steel sheet with aluminium conductors; suitable for a 3 phase 4 wire 415 volts system with full neutral and
continuous internal earth conductor of half size similar to the Telemecanique Canalis range.
The system shall be complete with all necessary fittings, tap-off unit brackets, etc. and tap-off point on both sides of
the busbar trunking system. All busbar trunking fittings (elbow, tees, end Cable Tap Box, etc.) shall be IP55 in
accordance to IEC 60529 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 5m, 3m,2,5m, 1,5m, 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’.
2.
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 60834
Resistance to flame propagation conforming IEC 60332 Part 3.
Resistance of the materials to abnormal heat conforming IEC 60695 Part 2.
3.
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)
4.
Conductors
Conductors shall be of hard drawn 99% purity Aluminium. Live conductors shall be air insulated and supported on
fibreglass reinforced polyester isolators, at 250mm intervals.
Conductors shall be fitted with bimetal silver-plated copper/aluminium laminate riders, electrically welded to junctions
and tap off positions.
Full size neutral of the same cross-sectional area as the phase conductor shall be provided for all ratings of the busbar
trunking system.
The busbar trunking system shall have the following characteristics:
Rated Insulation Voltage (A/C)
Rated Operating Voltage (A/C)
Frequency
:
Last update :30-04-17
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:
:
50Hz
660 Volts
660 Volts
Technical specification for tender
5.
582730219
Protective Conductor
Integral continuous internal copper conductor of cross-section area equal to 50% that of the corresponding phase
conductor shall be provided.
6.
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
415V 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.
7.
Temperature Rise
The maximum hot-spot temperature rise at any point of the busbar enclosure at continuous rated load shall not exceed
40o C above the maximum ambient temperature of 50o C in any position, as required by IEC 60439.
8.
Joints
All busbar joints shall be of silver plated copper.
Electrical connection shall be via a joint with spring and silver graphite contacts. This joint shall absorb the differential
conductor/casing expansion of each length equally.
For ratings from 100A to 400A, the joint shall automatically and simultaneously connect all the live conductors.
For ratings from 500A to 1000A, electrical connection shall be made by a ¼ screw turn for each conductor.
The joints shall be so designed as to allow removal of any length without disturbing adjacent lengths.
9.
Enclosure
The metal enclosure of the busbar trunking system shall be of hot dip galvanised steel painted to provide high
protection and mechanical resistance for the phase conductors along the entire length.
In order to limit magnetic field around the busbar system, aluminium enclosures are not acceptable.
10.
Tap-Off Outlets
Tap-off outlets on both sides of the trunking shall be at no more than 1m interval. It shall be possible to use them
simultaneously.
Tap-off outlets shall be connected to the isolators to form a block, holding the bars. They shall have a shuttered outlet
which is opened and closed automatically when tap-off units are plugged in or remove.
Protection level of the tap off outlet shall be at least IP55 by construction.
11.
Tap-off unit
Tap-off units shall be from the same manufacturer as the busbar trunking system and shall be provided with off-load
isolator suitable for fuses or circuit breakers according to ratings as indicated in the drawings.
All circuit breakers used shall be able to operate normally when mounted upside down or at any angles. The tap-off
units shall also have the provision to mount the earth fault relay together with the breaker. Tap-off units shall be of
Last update :30-04-17
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Technical specification for tender
582730219
dust and damp proof version, degree of protection IP 55 with silver plated contacts suitable for all ratings of busbar
and shall be suitably earthed.
The earthing contact of the tap-off unit shall always be made before that of the live conductors and the last to break
during removal.
The MCCB used in the tap-off unit must comply to IEC 60947-2. All MCCBs shall have a rated service breaking
capacity(Ics) of RMS value at 415VAC equal or higher than the prospective fault level of installation. It shall have
current limiting capabilities to protect the busbar trunking system and co-ordination table shall be furnished by
manufacturer.
The tap-off unit and the busbar trunking system shall be interlocked to ensure that the MCCB is in the ‘OFF’ position
prior to installation or removal of the unit.
The tap-off unit for MCCB shall have an interlock which prevents the cover from being opened while the device is in
the ‘ON’ position and to prevent accidental closing of the device when the cover is opened.
Tap off units for fuses or MCB shall have an isolator. Isolation (AC22 to AC20) shall be achieved by opening the
cover of the unit.
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