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(a) Circuits supplying power to ungrounded receptacles for hand-held, cord-and plug-connected equipment shall meet the following requirements:
(1) The circuits shall be electrically isolated from any distribution system supplying areas other than the cell line working zone and shall be ungrounded;
(2) The circuits shall be supplied through isolating transformers with primaries operating at not more than 600 volts between conductors and protected with proper overcurrent protection;
(3) The secondary voltage of the isolating transformers may not exceed 300 volts between conductors; and
(4) All circuits supplied from the secondaries shall be ungrounded and shall have an approved overcurrent device of proper rating in each conductor.
(b) Receptacles and their mating plugs for ungrounded equipment may not have provision for a grounding conductor and shall be of a configuration that prevents their use for equipment required to be grounded.
(c) Receptacles on circuits supplied by an isolating transformer with an ungrounded secondary:
(1) Shall have a distinctive configuration;
(2) Shall be distinctively marked; and
(3) Shall not be used in any other location in the facility.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. New section filed 5-5-2008; operative 5-5-2008. Submitted to OAL for printing only pursuant to Labor Code 142.3(a)(3) (Register 2008, No. 19).
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