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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 36. Work Procedures and Operating Procedures (Formerly Article 85)
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§2940.9. Protection from Backfeed Voltages.

Before contacting the high voltage side of deenergized transformer(s), or conductor(s) connected thereto, all possible sources of backfeed shall be eliminated by:

(a) disconnecting or grounding the high voltage side, or

(b) disconnecting or short circuiting the low voltage side.

EXCEPTION: System(s) worked as energized.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New section filed 2-22-88; operative 3-23-88 (Register 88, No. 9).

2. Editorial correction of first paragraph (Register 95, No. 32).

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