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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 147. Bulk Plants

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5621. Electrical Equipment.

(a) This section shall apply to areas where Class I liquids are stored or handled. For areas where Class II or Class III liquids only are stored or handled, the electrical equipment may be installed in accordance with the provisions of the California Electrical Safety Orders for ordinary locations.

(b) All electrical equipment and wiring shall be of a type specified by and shall be installed in accordance with the California Electrical Safety Orders.

(c) So far as it applies Table FL-19 shall be used to delineate and classify areas for the purpose of installation of electrical equipment under normal circumstances. In Table FL-19, a classified area shall not extend beyond an unpierced wall, roof or other solid partition. (Title 24, T8-5621)

Table FL-19

Location

Class 1 Group D Division

Extent of
Classified Area

Tank Vehicle and Tank Car
Loading though Open Dome 1 Within 3 feet of edge of dome, extending in all directions.
2 Area between 3 feet and 15 feet from edge of dome,extending in all directions.
Loading thought Bottom Connections with Atmospheric Venting 1 Within 3 feet of point of venting to atmosphere, extending in all directions
2 Area between 3 feet and 15 feet from point of venting to atmosphere, extending in all directions. Also up to 18 inches above grade within a horizontal radius of 10 feet from point of loading connections.
Loading though Closed Dome with Atmospheric Venting 1 Within 3 feet of open end of vent, extending in all directions.
2 Area between 3 feet and 15 feet from open end of vent, extending in all directions. Also within 3 feet of dome, extending in all directions
Loading though Closed Dome with Vapor Recovery 2 Within 3 feet of point of connection of both fill and vapor lines, extending in all directions
Bottom Loading with Vapor Recovery or Any Bottom Unloading 2 Within 3 feet of point of connections, extending in all directions.Also up to 18 inches above grade within a horizontal radius of 10 feet from point of loading connections.
Drum and Container Filling
Outdoors, or Indoors with Adeqate 1 Within 3 feet of vent and fill opening, extending in all directions.
2 Area between 3 feet and 5 feet from vent or fill opening, extending in all directions.Also up to 18 inches above grade within a horizontal radius of 10 feet from vent or fill opening.
Tank- Aboveground
Shell, Ends, or Roof and Dike Area 2 Within 10 feet from shell, ends, or roof of tank. Area inside dikes to level of top of dike.
Vent 1 Within 5 feet of open end of vent, extending in all directions.
2 Area between 5 feet and 10 feet from open end of vent, extending in all directions.
Floating Roof 1 Area above the roof and within the shell
Pits
Without Mechanical Ventilation 1 Entire area within pit if any part is within a Division 1 or 2 classified area.
With Mechanical Ventilation 2 Entire area within pit if any part is within a Division 1 or 2 classified area.
Containing Valves, Fittings, or Piping, and Not Within a Division 1 or 2 Classified Area. 2 Entire pit.
Pumps, Bleeders, Withdrawal Fittings, Meters and Similar Devices
Indoors 2 Within 5 feet of any edge of such devices, extending in all directions. Also up to 3 feet above floor or grade level within 25 feet horizontally from any edge of such devices.
Outdoors 2 Within 3 feet of any edge of such devices, extending in all directions. Also up to 18 inches above grade level within 10 feet horizontally from any edge of such devices
Storage and Repair Garage for Tank Vehicles 1 All pits or spaces below floor level.
2 Area up to 18 inches above floor or grade level for entire storage or repair garage.
Drainage Ditches, Separatores, Impounding Basins 2 Area up to 18 inches above ditch, separator or basin. Also up to 18 inces above grade within 15 feet horizontally from any edge.
Garages for Other Than Tank Vehicles Ordinary If there is any opening to these rooms within the extent of an outdoor classified area, the entire room shall be classified the same as the area classification at the point of the opening.
Outdoor Drum Storage Ordinary
Indoor Warehousing Where there is no Flammable Liquid Transfer Ordinary If there is any opening to these rooms within the extent of an indoor classification area, the room shall be classified the same as if the wall, curb, or partition did not exist.
Office and Rest Rooms Ordinary

HISTORY

1. Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No. 29).

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