1. National Electrical Code
  2. Quizzes

Code Quiz

June 5, 2008
Which of the following wiring methods is the only one permitted to be installed under the roof decking in an industrial building without a minimum 1 ½-inch spacing from the bottom edge of the roof decking?

Q. Which of the following wiring methods is the only one permitted to be installed under the roof decking in an industrial building without a minimum 1 ½-inch spacing from the bottom edge of the roof decking?

  1. Metal clad (MC) cable
  2. Electrical metallic tubing (EMT)
  3. Rigid nonmetallic conduit (RNC)
  4. Rigid metallic conduit (RMC)

Answer: D

As per 300.4(E), the only wiring methods permitted to be installed without a 1 ½-inch space between the wiring method and the roof decking are intermediate metallic conduit (IMC) and RMC.

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!

Continue Reading

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...

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.

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...