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Answer :
Final answer:
The National Electrical Code (NEC) allows approximately 25 AWG #12 THHN conductors in a 1" RMC based on a 40% fill capacity.
Explanation:
The question is asking how many AWG #12 THHN (American Wire Gauge #12 Thermoplastic High Heat-resistant Nylon-coated) conductors can be installed in a 1" Rigid Metal Conduit (RMC). The answer depends on the fill capacity of the conduit. According to the National Electrical Code (NEC), for RMC the fill capacity is 40%. A single AWG #12 THHN conductor has a conductor size of approximately 0.0133 square inches.
Therefore, to calculate the number of conductors, you would divide the total allowable fill capacity of the conduit by the size of the conductor. A 1" RMC has an approximate internal area of 0.86 square inches, and 40% fill capacity is about 0.344 square inches. Hence, you can approximately fit 25 AWG #12 THHN conductors in a 1" RMC per the NEC.
Learn more about Conduit Fill Capacity here:
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