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Old 04-23-2012, 09:29 PM   #1
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Default Grounding Bushings
Are grounding bushings required on a sub panel feeder.
Feeder is a 277/480 volt, 3 phase, 4 wire, 2500 amp.
Ten 3" EMT conduits paralleled out of the power source panel overhead using concentric knock outs.
Each conduit has 4 # 350 mcm Al and 1 # 600 AL equipment ground.

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Old 04-23-2012, 09:33 PM   #2
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Look at 250.97 and welcome to the show

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Old 04-23-2012, 09:37 PM   #3
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Thank you.
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