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Sole Connections

Question: At 250.66(A) and (B), the Code refers to a "sole connection to the grounding electrode.” Please explain what sole connection means; and is the term sole...

Are there any provisions in the NEC that address the de-energizing...

Question Are there any provisions in the NEC that address the de-energizing of rooftop photovoltaic (PV) wiring in an emergency situation for first responder emergency...

What’s Happening to Table 310.15(B)(7)?

Question In the 2011 NEC, does Table 310.15(B)(7) override any ampacity adjustment factors, such as temperature correction factors, or do any ampacity adjustment factors render...

Would addition of the control circuit conductors in one conduit of...

Question A parallel conductor branch circuit is run from a switchboard to a 3-phase rooftop air-conditioning unit using two metric designator 63 (2½ in. trade...

Dry-Type Transformer, Grounding & Bonding Terminations

Question Grounding and bonding termination points in dry-type transformers are seemingly an issue in that the NEC apparently is silent on where in a dry-type...

Are there any practical guidelines available to installers and the enforement...

Question A continuous load is defined as "a load where the maximum current is expected to continue for 3 hours or more.” Are there any...

Is it code-compliant to install Type NM cable exposed in an...

Question Is it code-compliant to install Type NM cable exposed in an attached residential garage? How about a detached garage? What about a detached residential...

Radio equipment that uses a screw-type fastener to bond or attach...

Question We have some radio equipment that uses a screw-type fastener to bond or attach the grounding conductor to the antenna assembly. Can this screw...

We have some radio equipment that uses a screw-type fastener to...

Question We have some radio equipment that uses a screw-type fastener to bond or attach the grounding conductor to the antenna assembly. Can this screw...

Do washing machines require GFCI protection?

Question An inspector told me the other day that a washing machine in a dwelling unit required GFCI protection. I’ve looked and I can’t find...
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