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Where a water system as described in Section 2395.81 is not available, the grounding connection shall be made to any of the electrodes specified in (a) through (d) below, where available.
(a) The metal frame of the building, where effectively grounded.
(Title 24, Part 3, Section 250-81(b).)
(b) An electrode encased by at least 2 inches of concrete, located within and near the bottom of a concrete foundation or footing that is in direct contact with the earth, consisting of at least 20 feet of one or more steel reinforcing bars or rods of not less that 1/2-inch diameter, or consisting of at least 20 feet of bare copper conductor not smaller than No. 4 AWG.
(Title 24, Part 3, Section 250-81(c).)
(c) An electrically continuous metal underground gas piping system that is uninterrupted with insulating sections or joints and without an outer nonconductive coating, and then only if acceptable to and expressly permitted by both the serving gas supplier and the authority having jurisdiction.
(Title 24, Part 3, Section 250-83(a).)
(d) Other local metal underground systems or structures, such as piping systems and underground tanks.
(Title 24, Part 3, Section 250-83(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 8-27-86; effective thirtieth day thereafter (Register 86, No. 37).