Cable Bus vs. Bus Duct
Comparison of the two technologies

Bus duct is defined in the NEC 368.2 as a grounded metal enclosure containing factory mounted, bare or insulated conductors, which are usually copper or aluminum bars, rods, or tubes
Types of Bus duct
- Air insulated
- Air insulated with segregated phase barriers
- Gas insulated (sulfur hexafluoride)
- Isolated phase
- Forced Cooled
- Enclosed oil cooled
Comparison of Bus Duct and Cable Bus
Bus Duct | ![]() |
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System arrives as complete made to measure segments with conductors factory installed, only needing assembly.
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Arrives in pre-cut easy to assemble segments.
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Busbar jointing can be simple, through the use of bolted connections.
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Conductors are fully continuous throughout system.
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Busbar jointing can be effective, through the use of copper welding, or clamped joints.
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Maintains free air rating.
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Many system types available for specific application needs.
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Only one type needed for almost all applications. |
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