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Technical specification for tender Medium Power Busbar Trunking System Specifications Distribution Application from 100A to 1000A Last update :11-05-17 582772382 Technical specification for tender 582772382 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 :11-05-17 Technical specification for tender 1. 582772382 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 :11-05-17 -3- : : 50Hz 660 Volts 660 Volts Technical specification for tender 5. 582772382 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 :11-05-17 -4- Technical specification for tender 582772382 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. Last update :11-05-17 -5-