§ 39.104. Working space about electrical equipment.
(a) Adequate working space with secure footing shall be maintained about electrical supply equipment which requires adjustment or examination during operation.
(b) Working spaces about exposed live parts over 300 volts to ground shall be made inaccessible to other than authorized attendants by the use of suitable barriers when necessary.
(c) The spaces shall be arranged so as to give authorized attendants ready access to all parts requiring attention and if practicable, unless used only for infrequent construction, inspection, and repair, shall provide the following minimum working spaces:
(1) If there are exposed live parts from 300 volts up to 750 volts on one side, the minimum width shall be 2 1/2 feet; above 750 volts, not less than three feet.
(2) If there are exposed live parts from 300 volts up to 750 volts on the both sides, the minimum width shall be 3 feet; above 750 volts, not less than 5 feet.
Cross References This section cited in 34 Pa. Code § 39.105 (relating to guarding live parts); 34 Pa. Code § 39.143 (relating to isolation by elevation); and 34 Pa. Code § 39.177 (relating to guarding live parts).
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