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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 4. Service and Service Entrance Equipment (Formerly Article 53)
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§2723. Service Entrance Conductors and Clearances.

Service entrance conductors to buildings or enclosures (including transformer vaults and enclosures, and substations, indoor and outdoor) shall be installed to conform to one of the following methods:

(Title 24, Part 3, Section 3-230-202.)

(a) Overhead service entrance conductors shall be permitted to be run open and unguarded, in which case they shall be supported and maintained at clearances not less than the minimum required by General Order No. 95, Rules for Overhead Electric Line Construction of the California Public Utilities Commission, 1981 Edition.

(Title 24, Part 3, Section 3-230-202(c).)

(b) Open service entrance conductors shall be attached to the building at one point only, and shall be suitably guarded against accidental contact. The length of open conductor between such point of attachment and the point where the conductors enter the building or the raceway shall be as short as practicable, but in no case greater than 3 feet. There shall be a conspicuous and permanent "HIGH VOLTAGE" sign placed on the outside immediately adjacent to the point of attachment.

(Title 24, Part 3, Sections 3-230-202(e) and 3-230-203.)

(c) Where service entrance conductors are installed in or on a building other than a substation or transformer vault or transformer enclosure, the conductors within and upon the building shall have an approved insulation and shall be installed in rigid conduit or in other approved raceways, or as metal-clad cable approved for the application.

(Title 24, Part 3, Section 3-230-202(j).)

(d) Suitably insulated service entrance conductors shall be permitted to be installed underground in conduit, raceway, pre-assembled flexible conduit, or shall be permitted to be direct buried at a depth of at least 36 inches. A grounded neutral conductor or an equipment grounding conductor, either bare or insulated, shall be permitted to be installed in the service entrance conduit or raceway or shall be permitted to be direct buried immediately adjacent to the associated service entrance conduit, raceway, or direct buried ungrounded conductors.

(Title 24, Part 3, Section 3-230-202(b).)

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 18943(c), 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).

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