National Electrical Code Articles and Information

Code Quiz: Article 424, Part 5

Based on the 2017 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Codebookcity.com. Since 1996, he has been writing National Electrical Code articles for electrical trade magazines and has an extensive portfolio of hundreds of NEC articles.

Article 424 provides the requirements for fixed electric space-heating equipment.

1. Can you install heating cables on dry board in the ceiling??
   

2. If you install heating cables in ceilings, what condition must any decorative panels meet?
   
3. If you run free nonheating leads in a junction box, what's the minimum lead length that must be in the box?
   
4. If you install heating cables in concrete, can you protect them with EMT or is that wiring method not approved for this purpose?
   
5. If you install heating cables under a floor covering, how must you secure them?

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