A.
Emergency controls required. An approved fixed fire-extinguisher system suitable for the extinguishment of Class B fires and covering the entire gasoline dispensing area shall be installed at each self-service pumping area. Said system shall be capable of being activated both manually and automatically; however, the triggering device for manual activation shall not be more than 15 feet from the attendant's principal control location and not more than 100 feet from the dispensers. Said system shall, however activated, automatically shut off the electric power to all dispensing devices. "Class B fires" are fires due to flammable liquids, gases and greases.
B.
Dispensing device controls required. Hose nozzle valves used at self-service dispensing of Class I liquids shall be listed automatic-closing types without a latch-open device. A control shall be provided that would permit the pump to operate only when the dispensing unit and the switch for this dispensing unit are manually actuated. This control shall also stop each pump when each nozzle has been returned to its bracket. A control shall be provided which will shut off the entire self-service system when the attendant is absent from the control console for any reason whatsoever, and the switch location shall not be more than 100 feet from the dispensers.