34 Pa. Code § 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.
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