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Subject - switchboard rubber mat
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gftodd
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Can anyone tell me at what voltage a rubber mat would be required in front of a switchbord with front exposed to live parts. This question was on the Deleware master electrician test. I've beat my brains trying to locate any reference to this question in the code.
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Ryan_J
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250.174(C) On Live-Front Switchboards. Instruments, meters, and relays (whether operated from current and potential transformers or connected directly in the circuit) on switchboards having exposed live parts on the front of panels shall not have their cases grounded. Mats of insulating rubber or other suitable floor insulation shall be provided for the operator where the voltage to ground exceeds 150.
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gftodd
| quote:
Originally posted by gftodd
Can anyone tell me at what voltage a rubber mat would be required in front of a switchbord with front exposed to live parts. This question was on the Deleware master electrician test. I've beat my brains trying to locate any reference to this question in the code.
Ryan, thanks for the answer , I figured someone here would be able to help.
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Ryan_J
| You're welcome :)
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