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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 6. Grounding (Formerly Article 55)

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§2740. Solidly Grounded Neutral Systems.

(a) Grounding of solidly grounded neutral systems shall be accomplished in a manner illustrated by Diagram 2740 if the system neutral is available at the service entrance equipment.

(b) If the grounded neutral conductor is carried into the premises, it shall be identified as the grounded conductor. The minimum insulation level for neutral conductors of solidly grounded systems shall be 600 volts.

EXCEPTION: Bare conductors be used for the neutral of direct buried portions of solidly grounded systems.

(c) The neutral grounding conductor shall be permitted to be a bare conductor if properly isolated from phase conductors and protected from physical damage.

(d) Equipment grounding circuit conductors shall be permitted to be bare and shall be connected to the ground bus and grounding electrode conductor at the service entrance equipment. (See Diagram 2740.)

(e) Multiple grounding of the equipment grounding conductor is permitted.

(f) The use of multiple neutral grounds on exterior wiring systems is permitted.

(Title 24, Part 3, Section 250-152.)

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

HISTORY

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).

Diagram 2740 SOILDLY GROUNDED SYSTEM

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

HISTORY

1. Repealer of Diagram 2740(a) and new Diagram 2740 filed 12-10-87; operative 1-9-88 (Register 88, No. 1).

2. Change without regulatory effect providing more legible versions of Diagram 2740 filed 11-6-2008 pursuant to section 100, title 1, California Code of Regulations (Register 2008, No. 45).

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