Marking Requirements for Circuit Breakers Used as Switches

Circuit breakers used to switch 120V or 277V fluorescent lighting circuits shall be listed and marked _____.

a) UL
b) SWD or HID
c) Amps
d) VA

See answer and applicable Code reference

The correct answer is: b) SWD or HID

Article 240 outlines the requirements for overcurrent protection. Parts I through VII of this Article provide the general requirements for overcurrent protection and overcurrent protective devices not more than 1,000V, nominal. As noted in Sec. 240.83(D), "Circuit breakers used as switches in 120V and 277V fluoresecent lighting circuits shall be listed and shall be marked SWD or HID. Circuit breakers used as switches in high-intensity discharge lighting circuits shall be listed and shall be marked as HID."

 

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