1. Housing

• The busbar trunking housing shall be constructed of code gauge steel and aluminum to reduce hysteresis and eddy current loses and shall be provided with a suitable protective finish of ANSI 49 grey epoxy paint.
• The busbar trunking housing shall be totally enclosed non-ventilated for protection against mechanical damage and dust accumulation. And it shall pass at least 500 hours salt spray test to ensure the anticorrosion ability.
• The totally enclosed housing shall be manufactured by the busbar trunking manufacturer. Modifications of busbar trunking to make it totally enclosed by other than the busbar trunking manufacturer voids the manufacturer’s warranty. Busbar trunking so modified is unacceptable without the written consent of the manufacturer.

2. Busbars

• Busbars shall be of hard drawn sliver-plated high conductivity copper of 99.9% purity or aluminum with bimetal cladding utilized Molecular Fusion technology
• There shall be no bolts passing through the busbars of the busway

3. Insulation

• Each busbar shall be insulated with Class B (130 ℃ DuPont Mylar) or Class F rated (155℃ DuPont Melinex) polyester film. Epoxy insulation is not allowed.
• The temperature rise at any point of the busbar trunking enclosure shall not exceed 55 degree Centigrade rise above ambient temperature when operation at rated current.

4. Support of busbar Trunking

• Hanger spacing shall be noted on layout drawings and shall not exceed manufacturer’s recommendations.
• Indoor feeder and plug-in busbar trunking shall be approved for hanger spacing of up to 3 meters for horizontally mounted run and 4.88 meters for vertically mounted runs. Outdoor feeder busbar trunking shall be approved for spacing of up to 1.5 meters for horizontally or vertically mounted runs.

Aluminum Busway

Cooper Busway