Liquefied Petroleum Gases Bulk Storage Regulations (C.R.C., c. 1152)

28 Each storage tank exceeding 1,000 Imperial gallons water capacity shall be electrically grounded for protection against static electricity and lightning, as prescribed in National Fire Protection Association Pamphlet No. 77. The resistance to electrical discharge to ground should be as low as possible and preferably not more than 6 ohms.