(a) Approved lot service equipment supplied by underground feeders may be of the self-supporting type and shall be stabilized by concrete not less than three and one-half (3 ½ ) inches thick and surrounding the equipment base by not less than six (6) inches beyond the equipment base in all directions.

(b) Approved lot service equipment supplied by underground feeders requiring installation on a mounting post shall be securely fastened to a nominal four (4) inches by four (4) inches redwood or pressure treated post or equivalent. The post shall be installed not less than twenty-four (24) inches in the earth and stabilized by a concrete pad. The concrete pad shall be not less than three and one-half (3 ½ ) inches thick, surrounding the post base by not less than six (6) inches beyond the post base in all directions. The equipment shall be mounted with the bottom of the equipment not less than twelve (12) inches above the stabilizing concrete pad.