BUSBAR TRUNKING SYSTEMS ( BUSWAYS /BUS RISERS )

BUSBAR TRUNKING SYSTEMS ( BUSWAYS /BUS RISERS )

1. 
   Busways shall be permitted for installation only where adequate access is available for inspection and repair throughout their entire length.
   

2. 
   The design, manufacture, testing and performance of the busbar trunking system shall be in accordance with the latest edition of BS EN 60439.
   

3. 
   Each piece of busbar trunking before it leaves the factory shall be tested for 3.5kV Dielectric test for 4 seconds & 1000V Megger test. Test certificates for the same shall be produced during DEWA inspection.
   

4. 
   The busbars shall be totally enclosed in a non-ventilated, low impedance sandwich design. The busbar trunking shall be sandwiched throughout its entire length and shall not be flared at tap-points.
   

5. 
   Before and after installation at sites, each piece and run of busbar trunking shall be Megger tested at 1000V.
   

6. 
   Each busbar riser, proposed for installation in high rise buildings shall be designed ensuring reliability of power supply with maximum 12 floors interrupted during outage of the respective busbar riser.
   

7. 
   Connections to switchgear shall be with flanged end units of specific design and manufactured by the busbar trunking manufacturer.
   

8. 
   The busbar trunking shall be properly aligned and securely fixed, not exceeding 1.5m (or as recommended by the manufacturer) centers with adequate support to take the weight of the busbar by means of galvanized fixing brackets; comprising hanger clamp, fixing channel and damping screw, supplied by the busbar trunking manufacturer. Additional supports shall be provided where required and as recommended by the trunking manufacturer.
   

9. 
   The busbar trunking system including flanges, elbows, tap-off boxes, supports etc. shall be of the type, size and location as indicated in the DEWA approved drawings.
   
10. 
    The busbar shall carry its rated current without exceeding 55ºC over an ambient temperature of 50ºC at 90% relative humidity in any plane without de-rating and without affecting the DEWA power supply requirements.
    

11. 
    Wherever busbar trunking system is installed on the supply side of any DEWA's KWh metering, suitable provision for sealing by DEWA shall be made as specified under section 3 of this regulation.
    

12. 
    The phase bus bar, neutral bar and earth bar shall be of copper, colour identified as given in Appendix.6. The neutral bar shall be of the same cross section as the phase bus bar.
    

13. 
    The requirement of earth continuity conductor (ECC) and equipotential bonding shall be as specified under Section.5 of this Regulation.
    

14. 
    Wherever the busway passes through the wall or floor, it shall be provided with fire barrier/sealing to the degree of fire resistance required.
    

15. 
    The tap off unit installed at each floor level in a busbar riser shall be at a height between 50 cm and 180 cm from finished floor level and shall have adequate access for operation, maintenance and replacement.
    

3. 
   
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