National Electrical Code Articles and Information

Code Quiz: Article 411

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 411 provides the requirements for industrial control panels intended for general use and operating at 1000V or less.

1. Article 411 covers lighting systems operating at (or under) 30V dc or 60V ac; does it also cover their associated components?
   

2. If wet contact is likely to occur, do those limits stay the same? If they change, what are the new values?
   
3. If conductors run through a wall, what wiring methods can you use?
   
4. How do you ground the secondary circuits of these systems?
   
5. What is the maximum size branch circuit for supplying a low voltage lighting system?

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