§ 39.417. Handling switchboard equipment.
(a) Ungrounded metal parts of devices on switchboards shall be handled as if operating at the highest voltage to which any portion of the equipment on the same switchboard panel is subject, unless the parts are known, by test or otherwise, to be free from such voltage.
(b) When cable plug connectors are used, one end shall not remain hanging loose while the other end is connected to a live terminal. In handling instrument circuits, the secondary of a current transformer should never be opened when it is alive.
Cross References This section cited in 34 Pa. Code § 39.461 (relating to general requirements); 34 Pa. Code § 39.471 (relating to general requirements); and 34 Pa. Code § 39.491 (relating to general requirements).
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