Section 250.52. Grounding Electrodes.

(A) Electrodes Permitted for Grounding. {As in NEC}

(B) Not Permitted for Use as Grounding Electrodes.

The following may not be used as grounding electrodes:

(1) Gas piping or any other metallic piping or tank that contains flammable liquids

(2) {As in NEC}

(3) {As in NEC}