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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
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§2813. Underground Vaults.

Except to the extent that the following subsections (a) and (b) provide otherwise, manholes or underground rooms in which it may be necessary for persons to work shall comply with Division 4, Sections 8051 through 8057 of the California Public Utilities Code, which is hereby incorporated by reference:

(a) The inside measurement shall be not less than 4 feet between the end walls and between the side walls thereof, or if circular in shape, not less than 4 feet in diameter inside measurement, and not less than 6 1/2 feet at all points between the floor and the top or ceiling.

(b) Any access opening to outer air shall be not less than 26 inches if circular in shape, or not less than 24 inches by 26 inches clear measurement if rectangular in shape.

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943, Health and Safety Code.


1. Editorial correction filed 11-2-83 (Register 83, No. 45).

2. Amendment filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

3. Amendment of first paragraph and repealer of last paragraph filed 12-9-2010; operative 1-8-2011 (Register 2010, No. 50).

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