34 Pa. Code § 39.303 - Protection against induced voltages
Telephone or other signaling equipment which is necessarily handled by persons and which is connected to a line that parallels a supply circuit in such manner that by reason of exposure to the supply circuit under normal operating conditions more than 150 volts are induced between the terminals of the signaling equipment and ground shall be protected by one or more of the following means:
(1) Exposed metal parts of the equipment
shall be insulated from the circuit, and the circuit shall be protected by
arresters having a breakdown potential not exceeding 1/2 the insulation between
the above named noncurrent-carrying metal parts and the current-carrying
parts.
(2) Cords shall have an
additional insulating tubing protection.
(3) Exposed noncurrent-carrying metal parts
shall be permanently grounded and current-carrying metal parts shall either be
permanently grounded or adequately shielded. Reference should be made to §
39.302 (relating to guarding
current-carrying parts).
(4)
Equipment shall be so located that persons coming into contact with the
equipment shall be obliged to stand either on an insulated platform or in a
booth of suitable insulating material.
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