National Electrical Installation Standards

Standards as High as Your Own

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Wednesday, September 20, 2017

Question:

Re: CQD answer published Monday, September 11, 2017 -Multiwire Grounded Conductor

Comment on: CQD answer published Thursday, September 10, 2017

In all honestly, the answer to the question did it no justice. Also, it was incomplete in my estimation since it didn't cover single wire (ungrounded) circuits.

First of all, the reference has a typo, it's Art 300, not 30.

Second, there was no mention of a "multiwire branch circuit" in the question. The jumper requirement only applies to that circuit which is defined:

Branch Circuit, Multiwire. A branch circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.

In a single wire (ungrounded) circuit, it's permissible to use the receptacle (device) to maintain grounded conductor continuity. From what I read of the question, that's what the submitter was trying to get an answer on.

Regards, Nick Abbatiello

A

Answer:

Hey Nick thanks for your comment. You are correct the answer could have been better. Section "30.13(B)" was meant to be "300.13(B)" and I hope the "0" doesn't get poorly misplaced in my paycheck.

Although the question didn't mention a multiwire branch circuit the answer did, meaning that if it is not a multiwire branch circuit (2 wire) then device connections can be used for providing the continuity of grounded conductors as you mentioned.

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