National Electrical Code Articles and Information

Code Quiz: Article 300

Based on the 2011 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..

1. How are you supposed to protect metallic raceway against corrosion?
    

2. What concern arises when portions of a raceway are exposed to different temperatures?
    

3. What are you required to do about it?
    

4. Does the NEC require you to compensate for thermal expansion and contraction in raceway, and if so what is that requirement?
    

5. If you run the wires for a PA system in your cable tray, is that a code violation?

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