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Subchapter 5. Electrical Safety Orders
Group 2. High-Voltage Electrical Safety Orders
Article 6. Grounding

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§ 2739.1. Grounding of Systems and Circuits-General.

(a) Grounding of high-voltage systems and circuits is permitted, but is not mandatory unless specifically required elsewhere in these regulations. Where high-voltage systems are grounded, the applicable requirements of this Article 6 shall apply.
(b) Grounding connections shall be arranged to prevent objectionable current in the equipment grounding conductor during normal system operation. The temporary current carried by the equipment grounding conductor during fault conditions, while the grounding system is performing its intended protective function, is not objectionable.
(c) Grounding connections shall be clamp type, pressure type, welded, or other approved type.
(d) Grounding electrodes shall be of corrosion-resistant material and of adequate size, number, and location to effectively ground the system.
(e) Local piping systems, well casings, and the like shall not be used as system grounding electrodes unless their resistance to ground will be maintained low enough to insure effective grounding.
(f) Identification of conductors.
(1) A conductor used as a grounded conductor shall be identifiable and distinguishable from all other conductors.
(2) A conductor used as an equipment grounding conductor shall be identifiable and distinguishable from all other conductors.
(g) Polarity of connections. No grounded conductor may be attached to any terminal or lead so as to reverse designated polarity.
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. Renumbering of former section 2739 to new section 2739.1, including amendment of section and Note, filed 4-1-2009; operative 4-1-2009. Submitted to OAL for printing only pursuant to Labor Code section 142.3 (Register 2009, No. 14).

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