All metal enclosed, electrically-operated circuits or equipment shall be grounded back to the on-site source from which the electric circuit originates, and which is effectively connected to the earth or provided with equivalent protection.
4 Va. Admin. Code § 25-40-2220
Statutory Authority
§§ 45.1-161.3, 45.1-161.294 and 45.1-161.305 of the Code of Virginia.