WIRING AND PROTECTION AND CONTROL EQUIPMENT
§ 39.141. Electrical protection from conductors.
(a) Conductors shall be suitable for the location, use, and voltage. Conductors shall be protected against excessive heating by the design of the system or by automatic cut-outs, unless grounded conductors, field excitation circuits, circuits supplying interconnected three wire systems of underground distribution, and other circuits the opening of which may cause special hazard to life through interruption of service. Such automatic cut-outs may be set so as to interrupt the circuits only on excessive short circuits, if constant attendance is provided and protection is thus also afforded by manual operation.
(b) Conductors normally grounded for the protection of persons shall be arranged without automatic cut-outs interrupting their continuity between the source of energy and the point at which the ground wire is attached, unless the operation of such a cut-out automatically results in the immediate disconnection of the grounded circuit from all sources of electrical energy.
(c) Conductors shall be provided with one or more suitable switches to effectively disconnect them from all sources of electrical energy.
Cross References This section cited in 34 Pa. Code § 39.156 (relating to cut-outs).
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