Work on Electrical Equipment and Circuits

DOE-HDBK-1092-98

to warn people against entry unless they have been authorized to enter and perform duties in these

locations.

5.10.1 WORK ON ELECTRICAL EQUIPMENT AND CIRCUITS

Before any work is performed on electrical equipment or circuits, the power source or sources shall

be deenergized unless power is a required part of the work procedure. Lockout procedures in 29 CFR

1910.147 and 29 CFR 1910.333 shall be followed. In addition, the following rules apply for

energized work:

1. Power-cable plugs and receptacles for circuits greater than 150 V potential to ground shall not

be connected or disconnected under load unless they are of the load-break type. Energized

power cables in excess of 150 V potential to ground shall be handled in accordance with

29 CFR 1910.331. Care shall be taken to prevent damage or shock and burn from the

energized cable.

2. Proper tools shall be used to remove or install fuses to protect people from shock or burns.

3. All safety-related electrical work practices covered by the provisions in 29 CFR 1910.331

through .335 shall be followed.

4. Exposed electric connections or resistor grids not protected by location shall be insulated

unless impractical. In this case, guarding shall be installed to prevent accidental contact by

people or equipment.

5. Communication conductors shall be installed in accordance with 30 CFR 57.12010 and

75.516-2.

6. Lights and lamps shall be properly guarded if they pose a hazard and shall be kept away from

combustible material.

5.10.2 GROUNDING

All electric circuits shall have a grounding system. The system shall protect people from injuries or

fatal shock on inadvertent contact. The system shall limit the voltage on all electrical equipment with

noncurrent-carrying metallic parts. Grounding of ac and dc equipment shall be in accordance with

29 CFR 1910.304(f).

Equipment grounding conductors shall comply with the standards expressed in 29 CFR

1910.304(f)(6)(i).

All installations, modifications, or repairs pertaining to grounding systems shall be followed by a

continuity test to ensure the integrity of the systems. The frequency and requirements of he review

shall conform to 30 CFR 57.12028.

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