SPD Connection Requirements

Where used, a surge protective device shall be connected to the grounded conductor of the circuit.

a) True
b) False

See answer and applicable Code reference

The correct answer is: b) False

Article 285 covers general requirements, installation requirements, and connection requirements for surge-protective devices (SPDs) permanently installed on premises wiring systems of 1,000V or less. As noted in Sec. 285.4, "Where used at a point on a circuit, the SPD shall be connected to each ungrounded conductor."

 

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