These changes make it clear that receptacles installed in Class I and Class II locations must be part of the building wiring. Article 501 Class I Locations Part III. Equipment 501.145 Receptacles and Attachment Plugs, Class I, Divisions 1 and 2 (A) Receptacles. Receptacles must be part of the premises wiring, unless they’re part of a temporary portable assembly [501.140(A)(5)], as shown in Fig. 31. (B) Attachment Plugs. Attachment plugs must provide for the connection of an ...

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