Busbar Trunking Spec

Technical specification for tender document.doc

Last update :19-04-23

Low Power Power Busbar Trunking System Specifications

Distribution Application from 40A to 160A


Table of contents:

1. GENERAL................................................................................................................................................................................3

2. CONFORMITY TO STANDARD..........................................................................................................................................3

3. ENVIRONMENT.....................................................................................................................................................................3

4. CONDUCTORS.......................................................................................................................................................................3

5. PROTECTIVE CONDUCTOR..............................................................................................................................................3

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

12. VOLTAGE DROP ALONG THE BUSBAR TRUNKING SYSTEM.................................................................................5

13. Test Reports/Certificates............................................................................................................................................................5

Last update :19-04-23


1. General

The busbar trunking system shall be of low impedance and air insulated typed technology. It shall be totally enclosed hot galvanised steel sheet painted with aluminium conductors; suitable for a 3 phase 4 wire 400 volts system with full neutral, similar to the Schneider Electric Canalis 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 IP55 in accordance to IEC 60 529 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. The complete installation shall be coordinated throughout and where possible, shall consist of standard 3m and 2m sections.

Horizontal runs of busbar trunking system shall be supported by hangers at every 2 meters.

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 60 439 Part 1 and Part 2.

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). All the system must be in compliance with ROHS directive.

4. Conductors

Conductors shall be of hard drawn 99% purity Aluminium EAlMgSi according EN 573-3 and ENAW-6101 standards. Live conductors shall be air insulated and supported on Noryl insulated rail.

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) : 500 VoltsRated Operating Voltage (A/C) : 500 VoltsFrequency : 50/60Hz

5. Protective Conductor

Enclosure of the busbar shall be used as earth. Equivalent cross section of enclosure shall be at least 100% of the phase.

Last update :19-04-23 - 3 -


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 400V 50Hz.

7. Temperature Rise

The maximum hot-spot temperature rise at any point of the busbar enclosure at continuous rated load shall not exceed 30o C above the maximum ambient temperature of 35o C in any position, as according IEC 60439 standard.

8. Joints

All busbar joints shall be of silver plated copper.

Electrical jointing between two straight elements shall be ensured by spring-loaded contacts designed to absorb differential expansion between the conductors and the casing.

Mechanical jointing between two straight elements shall be ensured by four captive screws which also guarantee continuity of protective conductor.

The joint shall automatically and simultaneously connect all the live conductors.

The joint will be IP55 by construction without supplementary accessories

9. Enclosure

The metal enclosure of the busbar trunking system shall be of hot galvanised crimped steel 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 one side of the trunking shall be at no more than 0.5m interval.

Tap off outlets shall be equipped with automatic shutters to prevent any accidental contact with live parts.

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 modular 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 IP55 as a standard.

Tap off unit jaws shall be of silver plated copper 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.

Both the trunking and the tap off unit shall have the capability to be equipped with colour-coded foolproofing device to ensure safety interlocking.

Last update :19-04-23 - 4 -


12. Voltage drop along the busbar trunking system

The line-to-line voltage drop of the 3 phase 400V 50H, under evenly distributed load at power factor of 0.8 lagging, shall not be over the following values :

Busbar rating Voltage Drop (V/100m/A)40A 0.38960A 0.163100A 0.075

13. Test Reports/Certificates

Test Reports/Certfiicates by recognised independent test laboratories (such as ASTA Certificate Services, ASEFA, KEMA) on the proposed equivalent type of busbar trunking system must be submitted to prove compliance with the specifications.

Last update :19-04-23 - 5 -

Documents

Busbar Trunking Spec