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Answer :
Final answer:
Straight runs of 1" RMC using threaded couplings must be secured at intervals not exceeding 10 feet, to comply with the National Electrical Code (NEC).
Explanation:
The student's question pertains to the installation of electrical conduit, specifically 1" Rigid Metal Conduit (RMC). Per the National Electrical Code (NEC), the regulation for securing straight runs of 1" RMC with threaded couplings stipulates that supports must be placed at intervals not exceeding 10 feet. If the conduit is not subject to damage, a support near each end of the run is allowable with a maximum spacing of 20 feet between supports. It's important to adhere to these standards for safety and code compliance.
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