WAC 296-46B-250 Grounding and bonding.

053(A)(2) Resistance of rod, pipe, and, plate electrodes

(3) For rod, pipe, and plate electrodes, if a ground resistance test is not performed to ensure a resistance to ground of 25 ohms or less, two or more electrodes as specified in NEC^® 250.52 must be installed a minimum of six feet apart. A temporary construction service is not required to have more than one made electrode.

(4) For services only, when multiple buildings or structures are located adjacent, but structurally separate from each other, any installed rod, pipe, or plate electrodes used for those services must be installed so that each building’s or structure’s electrodes are not less than six feet apart from the adjacent building’s or structure’s electrodes.

064 Grounding electrode conductor installation – Physical protection

(5) Grounding electrode conductors will be considered to be not exposed to physical damage when the conductor(s) are:

(a) Buried more than 12 inches deep in the earth outside the building’s footprint;

(b) Encased or covered by two inches of concrete or asphalt;

(c) Located inside the building footprint and protected by the building’s structural elements or when inside and determined, by the inspector, to not be subject to physical damage; or

(d) Enclosed by a metal or nonmetallic raceway or enclosure. The raceway or enclosure must be approved to protect from severe physical damage if it is not protected by appropriate physical barriers from contact with vehicles, lawn mowers, and other equipment that might damage the conductor or enclosure.

068 Accessibility.

(6) The termination point of a grounding electrode conductor tap to the grounding electrode conductor must be accessible unless the connection is made using an exothermic or irreversible compression connection.