General Specification:
The Bus duct & Rising Main are metal clad, totally enclosed non-segregated type, dust & vermin proof air insulated for use on 415 Volts, 50 Cycles AC supply.
The Bus duct & Rising Main are designed for operation in high ambient temperature and high humidity tropical atmospheric conditions. This facilitates ease of inspection, cleaning and repair, for use in installations where continuity of operation is of prime importance.
Construction:
The Bus duct & Rising Mains are fabricated from 2/1.6mm thick CRCA sheet metal, with louvered covers on both sides of Bus duct & Rising Mains for adequate heat dissipation. Bus duct & Rising Main have top and bottom covers for visual inspection / maintenance.
Rubber / Cotton Bellows for enclosure are provided for avoiding DG/TR set vibration affecting the Bus duct / Rising Main.
Bus bars:
The bus bars are air insulated and made of high conductivity, high strength aluminum alloy complying with the requirements of Grade E91E of IS: 5082 or E.C. grade aluminum / copper as per the Customer requirements.
The Bus bars are suitably braced with non-hygroscopic SMC supports at suitable intervals in order to withstand the dynamic forces of Short Circuit at 50KA RMS, symmetrical for 1 sec. Large clearances and creepage distances are provided on the Bus bar system as per the relevant Indian Standard, .to minimize the possibility of a fault
The orientation of Bus bar shall be N-R-Y-B or inter-leaved i.e. R-Y-B-N.
The cross sections of bus bars for various rating are calculated as per IEC standard
Finishing:
All steel work used in the construction of Bus duct & Rising Main are powder coated (subsequent to the 7-tank process of pre-treatment) with epoxy based powder with specified shade as per national / international standards.
End Termination / Expansion Joints:
Bus duct / Rising Main shall be provided with Al / Cu flexible at the ends for proper alignment. After every 6 Meters of straight length portion, expansion joints shall be provided for accommodating the expansion of the Bus bars.
Optional Accessories(For Bus ducts)
- Phase Cross over (RYBN – NBYR)
- Neutral Cross over (NRYB – RYBN)
- Seal of Bushing
- Fire Proof Barrier
- Canopy for outdoor portion
- Silica gel breather
- Wall frame Assembly.
Inspection & Testing:
Following routine tests are conducted on the Bus duct:
⇒ Inspection of the Bus duct (Physical Measurement)
⇒ Verification of Phase sequence
⇒ Lightness of Joints
⇒ Dielectric Tests at High Voltage.
⇒ Insulation Resistance at 1000 Volts.
