What is the minimum size (copper) current-carrying conductor permitted for load side utilization equipment of low-voltage suspended ceiling power distribution systems?
A) 18 AWG
B) 16 AWG
C) 20 AWG
D) 24 AWG
Find the Answer
Answer: D
The construction specifications for the sizes and types of conductors of low-voltage suspended ceiling power distribution systems are outlined in Sec. 393.104 of the 2014 NEC. As noted in 393.104(A), “current-carrying conductors for load side utilization equipment shall be copper and shall be 18 AWG minimum.” However, there is an Exception to this rule. The Exception states:
“Conductors of a size smaller than 18 AWG, but not smaller than 24 AWG, shall be permitted to be used for Class 2 circuits. Where used, these conductors shall be installed using a Chapter 3 wiring method, shall be totally enclosed, shall not be subject to movement or strain, and shall comply with the ampacity requirements in Table 522.22.”
Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at [email protected].