Code exceptions are easy to overlook and even easier to misapply. Can you identify the code exception that applies to the following question?
Question:
The metal frames of electrically heated appliances operated at over 150 volts to ground and exempted by special permission ______________required to be connected to an equipment grounding conductor. However the frames shall be permanently and effectively insulated from ground.
A. Shall be
B. Shall not be
C. May be
Solution:
B. Shall not be.
While it is true that Article 250.114 of the 2020 edition of NFPA 70 requires that the exposed, normally non-current carrying metal parts of cord-and-plug connected equipment shall be connected to the equipment grounding conductor under any of the circumstances listed in sections (2) through (4) of this article, and section (2) specifically references “where operated at over 150 volts to ground,” Exception No. 2 to (2) provides an exemption that would apply to the metal frames of electrically heated appliances given the context of this question.
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