For skin-effect heating, pull boxes installed for pulling the electrically insulated conductor in the ferromagnetic envelope shall be permitted to be buried under the thermal insulation, provided their locations are indicated by ________ markings on the insulation jacket surface and on drawings.
A) caution
B) permanent
C) warning
D) none of the above
Find the Answer
Answer: B
As specified in Sec. 427.46, “For skin-effect heating, pull boxes for pulling the electrically insulated conductor in the ferromagnetic envelope shall be permitted to be buried under the thermal insulation, provided their locations are indicated by permanent markings on the insulation jacket surface and on drawings.”
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].