NEC 2026 Compatible
A fire alarm circuit operating at 120V nominal, with a maximum current of 15A, is installed in a commercial building. If the circuit is run in a raceway with three other non-fire alarm power and lighting circuits, what is the minimum size copper conductor required for the fire alarm circuit, assuming THHN insulation and an ambient temperature of 30°C?
Master Level📋 NEC 760.41(B), NEC 760.43, NEC Table 310.16, NEC Table 310.15(C)(1)Fire Alarm Systems - Conductor Sizing and Derating
A
14 AWG
B
12 AWG
C
10 AWG
D
8 AWG
Explanation & Direct Citation
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