Storage Batteries Used for Emergency Power

A storage battery supplying emergency lighting and power shall maintain not less than 87½% of normal voltage at total load for a period of at least _____ hour(s).

a) 1
b) 1½
c) 2
d) 2½

See answer and applicable Code reference

The correct answer is: b) 1½

Article 700 focuses on the installation, operation and maintenance of emergency systems. As noted in the first sentence of Sec. 700.12(A), "Storage batteries used as a source of power for emergency systems shall be of suitable rating and capacity to supply and maintain the total load for a minimum of 1½ hours, without the voltage applied to the load falling below 87½% of normal."

 

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