Each resistance welder shall have an overcurrent device rated or set at not more than _____% of the rated primary current of the welder.
a) 80
b) 100
c) 125
d) 300
See answer and applicable Code reference
The correct answer is: d) 300
Article 630 covers apparatus for electric arc welding, resistance welding, plasma cutting, and other similar welding and cutting process equipment that is connected to an electrical supply system. As noted in Sec. 630.32(A), "Each welder shall have an overcurrent device rated or set at not more than 300% of the rated primary current of the welder. If the supply conductors for a welder are protected by an overcurrent device rated or set at not more than 200% of the rated primary current of the welder, a separate overcurrent device shall not be required."