(a) Precautions shall be taken to prevent the ignition of flammable vapors. Sources of ignition include but are not limited to open flames; lightning; smoking; cutting and welding; hot surfaces; frictional heat; static, electrical and mechanical sparks; spontaneous ignition, including heat-producing chemical reactions; and radiant heat.
(b) Category 1 or 2 flammable liquids, or Category 3 flammable liquids with a flashpoint below 100oF (37.8oC), shall not be dispensed into containers unless the nozzle or fill pipe and container are electrically interconnected. This can be accomplished by maintaining metallic contact during filling, by a bond wire between them, or by other conductive path having an electrical resistance not greater than 10 6 ohms.
(c) See Article 140 for electrical classifications.