Code Quiz of Day

Wireway Conductor Fill Limitation

March 17, 2014

NEC requirement on the conductor fill allowed in a metal wireway.

The sum of the cross-sectional areas of all contained conductors at any cross-section of a metal wireway shall not exceed _____.

a) 50%
b) 20%
c) 25%
d) 75%

See answer and applicable Code reference

The correct answer is: b) 20%

Article 376 of the 2011 NEC presents the requirements for installation of metal wireways. As clearly noted in 376.22(A), "The sum of the cross-sectional areas of all contained conductors at any cross section of a wireway shall not exceed 20% of the interior cross-sectional area of the wireway."

Voice your opinion!

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

Continue Reading

Dealing with Voltage Sags in Your Facility

Cable Identification Guidelines and Practices

Sponsored Recommendations

8 Types of Electrical Conduit and Their Uses

Electrical conduit is a tube or raceway used to house and protect electrical wires within a building or structure. From data centers to underground subways to ports and bridges...

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.

A Powerful Duo: Fiberglass conduit and solar applications

Learn how strong, durable fiberglass conduit excelled in an environment with dense cable and helped make a complex burial much simpler for the contractor to help this customer...