Back-Up, Back-Up Power

Article 700 outlines the requirements for installation, operation and maintenance of emergency systems.

June 25, 2014

A portable or temporary alternate source _____ whenever the emergency generator is out of service for major maintenance or repair.

a) shall not be required
b) is recommended
c) shall be available
d) shall be avoided

See answer and applicable Code reference

The correct answer is: c) shall be available

Article 700 outlines the requirements for installation, operation and maintenance of emergency systems. As noted in Sec. 700.4(A), "an emergency system shall have adequate capacity and rating for all loads to be operated simultaneously." In addition, the last sentence in Sec. 700.4(B) states: "A portable or temporary alternate source shall be available whenever the emergency generator is out of service for major maintenance or repair."