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Tuesday, October 26, 2021
Question:
Greetings,
When using three phase 480-volt temp power circuit in the on position, that is equipped with heavy electrical connectors (plugs/receptacles) to join cables together, should these connections be secured (locked) so unauthorized personnel can not come in contact with energized connections?
Thank you.
Bradley Pearman
A
Answer:
Hello Bradley,
Thanks for the question. First, the cables and connectors you mentioned in the question are permitted for use for temporary installations for testing and experiments, and development work. Section 590.4(B) indicates what is acceptable for use as temporary feeders. The Exception to this section indicates that single insulated conductors (referred to in the question) shall be permitted where installed for the purposes specified in Section 590.3(C), where accessible only to qualified persons. The term qualified person is defined in NEC Article 100. Hope this is helpful.