National Electrical Code Articles and Information

Code Quiz: Article 424, Part 2

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 fixed electric heating equipment in direct contact with combustile material?
   

2. Can you install separate disconnects for the heater, motor controller(s), and supplementary overcurrent protection?
   
3. If heating equipment has supplementary overcurrent protection, where must you install the disconnect?
   
4. If a heater contains a motor, at what horsepower rating do the requirements for the disconnect change?
   
5. When can you use the circuit breaker as the disconnecting means?

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