NEC Code Snippets

These timely snippets will inform you on important NEC 2014 code sections that will affect your daily electrical work.
The NEC 2014 was adopted in New Jersey September 21, 2015.
(The 6 month "Grace Period" ends March 21, 2016, after which all new applications for NJ electrical permits are required to use the NEC 2014)
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This Month's Snippet: Emergency Branch Circuits
NEW Section 700.19

The NEC 2014 no longer permits multi-wire branch circuits that are protected by common trip (aka: 2 or 3 pole) circuit breakers or single-pole breakers connected by handle ties used  to serve emergency lighting and power circuits.
 
Using multi-wire circuits, emergency lighting and power could be interrupted due to ordinary line-to-ground faults or other problems where common trip circuit breakers or breakers using handle ties are used.

This restriction also applies to the three or more lighting branch circuits, supplying normal lighting, in a separate and uninterrupted area, when you are using the exception for unit equipment that normally requires it to be on same branch circuit as normal lighting.
          See revised section 700.12(F)(2)(3) exception for unit equipment.

Applicable Definitions:

Multiwire Branch Circuit. 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. (aka: shared neutral)

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