Question: Where RMC enters an enclosure, a bushing shall be provided to protect the wires from _____ unless the box, fitting, or enclosure is designed to provide such protection.
a) abrasion
b) arcing
c) faulting
d) grounding
See answer below.
Answer: a) abrasion
Section 344.46 states, "Where a conduit enters a box, fitting, or other enclosure, a bushing shall be provided to protect the wires from abrasion unless the box, fitting, or enclosure is designed to provide such protection."
About the Author
Ryan JacksonRyan Jackson
Ryan Jackson is a National Electrical Code instructor and textbook author in the Salt Lake City, Utah area. He is also a technical consultant for the Steel Tube Institute. He is a member of Code-Making Panels 3 and 17 for the National Electrical Code and serves on several technical committees for UL Standards and Engagement. He is certified as an inspector in electrical, building, mechanical, and plumbing codes, and has taught the NEC and NFPA 70E at the national level over the last three decades.