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NEC Quiz: Article 424, Part 7

by Mark Lamendola

Quiz Questions

Code Quiz: Article 424, Part 7

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 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. Part VII of Article 424 is titled "Resistance-Type Boilers" but what exactly is covered by Part VII?

  2. What are four types of use that require the equipment to be identified as suitable to that use?
  3. Does the type of vessel matter in regards to the overcurrent protection requirements? If not, why not? If so, how so?
  4. Field-wire conductors between the heater and supplementary overcurrent devices must be sized at least X % of the load. What is X?
  5. The end of Part VII specifies two types of limit control, and they are conditional. What are they, and what is the condtion for each one?

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