Arc length is measured from _____
a. the end of the electrode holder to the base metal
b. the end of the electrode core to the base metal
c. one end of the electrode to the other
d. the striking area to the ground clam
b
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If a stem is longer than ____ in., lateral braces must be placed within 12 in. (300 mm) of the luminaire, or an explosionproof flexible coupling must be used within 12 in. (300 mm) of the junction box.
A. 6 B. 10 C. 12 D. 14
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