Section 39.233. Where switches are required

(a) Suitable switches shall be inserted in all feeder conductors connecting utilization installations to service connections from either overhead or underground lines. These switches shall be readily accessible, and as close as practicable to the point of connection with overhead or underground lines.

(b) Suitable switches shall be inserted in all circuit leads, except a grounded conductor to motors, transformers, storage batteries, electric furnaces, and similar utilization equipment, except between parts or pieces of apparatus intended to operate as a unit. Switches installed for use on lighting and similar circuits under 1,320 watts are not required to interrupt all conductors of the circuit. Reference should also be made to § 39.211 (relating to electrical protection).

(c) Switches or plug connectors shall be placed in circuit leads at the point where temporary wiring or portable conductors are connected to the permanent wiring.