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| Bus Conductor: Bus Square Tube |
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This type of bus has low skin-effect ration much like that of round tubes, with the additional advantage of requiring simpler adapter plates for mounting on pedestal insulators. It is often used for generator phase and station bus in protected enclosures. The most commonly used alloys are 6101-T6 and 6063-T6, with staggered ventilation holes on top and bottom surfaces.
The ampacity values for standard sizes are shown for dc and ac current, using 30°C rise over 40°C ambient in still air.
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