National Electrical Code Articles and Information

Code Quiz: Article 410, Part 9

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 410 provides the requirements for luminaires, lampholders, and lamps.

1. Where a metal lampholder is attached to a flexible cord, an insulating bushing must be on the inlet; is the minimum pipe size for this 3/8 inch or 1/2 inch?
   

2. If a luminaire requires adjusting or aiming after installation, is it required to have an attachment plug or cord connector?
   
3. The 2017 revision of the NEC greatly expanded the requirements for electric discharge and LED luminaires. Can you connect one of these luminaires with a cord terminating in a grounding type attachment plug?
   
4. Can you use a luminaire as a raceway?
   
5. What's the minimum insulation temperature for feeder and branch-circuit conductors within 3 inches of an LED driver?

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