Question: Ground detectors for ungrounded system must be installed as _____ where the system receives its supply.
a) close as possible to
b) close as practicable to
c) far as possible from
d) far as practicable from
See answer below.
Answer: b) close as practicable to
According to Sec. 250.21(B)(2), "The ground detection sensing equipment shall be connected as close as practicable to where the system receives its supply."
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.