Download kgf busbar trunking spec

Technical specification for tender
High Power Busbar Trunking System
Specifications from 1600A to 6300A
Ventilated Busbar
Last update :14-05-17
841018409
Technical specification for tender
841018409
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.
EXPANSION JOINT ................................................................................................................................................................ 4
9.
JOINTS ...................................................................................................................................................................................... 4
10. ENCLOSURE ........................................................................................................................................................................... 4
11. TAP-OFF OUTLETS ............................................................................................................................................................... 4
12. TAP-OFF UNITS ...................................................................................................................................................................... 4
Last update :14-05-17
Technical specification for tender
1.
841018409
General
The busbar trunking system shall be of low impedance and ventilated typed technology. It shall be enclosed in painted
galvanised steel sheets with copper conductors; suitable for a 3 phase 4 wire 410 volts system, similar to the
Telemecanique Canalis KGF range.
The system shall be complete with all necessary fittings, tap-off unit brackets, etc. and tap-off point on one side of the
busbar trunking system. All busbar trunking fittings (elbow, tees, end Cable Tap Box, etc.) shall be IP31 in accordance
to IEC 529 and from the same manufacturer as the busbar trunking system. Busbar trunking shall be design to operate
under sprinklers.
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 3m and 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 439 Part 1 and Part 2.
Verification of fire barrier in accordance of the latest ISO 834 (DIN 4102 part 9)
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).
The busbar trunking shall be type tested by a third party laboratory to work under sprinklers.
4.
Conductors
Conductors shall be of hard drawn 99.9% purity Copper. Copper live conductors shall be insulated by 2 layers of
class “B” 130°C halogen free polyester fibre tape. Conductors shall be supported on insulators in glass fibre
impregnated polyester.
Conductors shall be fitted with bimetal copper/aluminium laminate riders, electrically welded to tap off positions.
Bimetal riders shall be silver-plated at each tap off position.
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:
Paint Finish
Rated Insulation Voltage (A/C)
Rated Operating Voltage (A/C)
Last update :14-05-17
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:
:
:
Grey Silex RAL 7032
750 Volts
750 Volts
Technical specification for tender
Frequency
841018409
:
:
50Hz
9.6 kV at sea level
Depending on the rating, each phase shall consists of 1 to 4 bars connected in parallel at each joint. Configuration of
conductors shall reduce electrodynamic forces in the event of a short-circuit.
5.
Protective Conductor
Casing shall be used as earth.
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
40oC above the maximum ambient temperature of 35o C.
8.
Expansion Joint
All lenght of 3m or more shall be fitted with an expansion joint which absorbs the differentianl expansion between
the busbars and the casing. The expansion joints shall be located in the centre of the 3m and 5m trunkings lenghts.
Those shall be composed of flexible laminates in the same metal as the conductors. The set of busbars shall be
clamped at each end of the trunking lenght to orientate the expansion towards the expansion joint.
9.
Joints
Electrical jointing between two straight lenghts shall be by bolting them together, using break head bolts. The tinned
connecting surfaces shall be design to carry the full rated current of the trunking. The electrical joints shall be design
for even distribution of contact pressure and with inspection covers provided on each side of the joint to facilitate
removal or extension.
10.
Enclosure
The metal enclosure of the busbar trunking system shall be of 1.5mm thick galvanised sheet to provide high protection
and mechanical resistance for the phase conductors along the entire length.
11.
Tap-Off Outlets
Tap-off outlets shall be design so that no live part can be accesssed when plugging or removing tap-off units.
12.
Tap-off units
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. Degree of protection shall
be at least IP31 with silver plated contacts suitable for all ratings of busbar.
Last update :14-05-17
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Technical specification for tender
841018409
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 947-2. All MCCBs shall have a rated service breaking
capacity (Ics) of RMS value at 410VAC 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 device is in the ‘OFF’ position
prior to installation or removal of the unit.
The tap-off unit for MCCBs 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.
Last update :14-05-17
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