Code Quiz: Load Side Utilization Conductor Size in Low-Voltage Suspended Ceiling Power Distribution System

July 21, 2016
NEC requirements for load side utilization conductor size in low-voltage suspended ceiling power distribution system  

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].

About the Author

Steven Owen

Voice your opinion!

To join the conversation, and become an exclusive member of EC&M, create an account today!

Sponsored Recommendations

Electrical Conduit Comparison Chart

CHAMPION FIBERGLASS electrical conduit is a lightweight, durable option that provides lasting savings when compared to other materials. Compare electrical conduit types including...

Don't Let Burn-Through Threaten Another Data Center or Utility Project

Get the No Burn-Through Elbow eGuide to learn many reasons why Champion Fiberglass elbows will enhance your data center and utility projects today.

Considerations for Direct Burial Conduit

Installation type plays a key role in the type of conduit selected for electrical systems in industrial construction projects. Above ground, below ground, direct buried, encased...

How to Calculate Labor Costs

Most important to accurately estimating labor costs is knowing the approximate hours required for project completion. Learn how to calculate electrical labor cost.