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PDFWAC 296-307-41047

What electrical requirements apply to LP-gas installations?

(1) Electrical equipment and wiring must be specified by and installed according to chapter 296-307 WAC Part T, for ordinary locations.
(2) Fixed electrical equipment and wiring installed within classified areas must comply with Table U-5 and must be installed according to chapter 296-307 WAC Part T.
EXCEPTION:
This provision does not apply to fixed electrical equipment at residential or commercial installations of LP-gas systems, LP-gas used as a motor fuel, or to LP-gas system installations on commercial vehicles.
TABLE U-5
Part
Location
Extent of classified area1
Equipment
shall be
suitable for
Class I,
Group D2
A
Storage containers other than DOT cylinders
 
Within 15 feet in all directions from connections, except connections otherwise covered in this table
 
Division 2
B
Tank vehicle and tank car loading and unloading3
 
Within 5 feet in all directions from connections regularly made or disconnected for product transfer
 
Division 1
 
 
 
Beyond 5 feet but within 15 feet in all directions from a point where connections are regularly made or disconnected and within the cylindrical volume between the horizontal equator of the sphere and grade (See Figure H-1)
 
Division 2
C
Gauge vent openings other than those on DOT cylinders
 
Within 5 feet in all directions from point of discharge
 
Division 1
 
 
 
Beyond 5 feet but within 15 feet in all directions from point of discharge
 
Division 2
D
Relief valve discharge other than those on DOT cylinders
 
Within direct path of discharge
 
Division 1
Note: Fixed electrical equipment should not be installed
 
 
 
Within 5 feet in all directions from point of discharge
 
Division 1
 
 
 
Beyond 5 feet but within 15 feet in all directions from point of discharge except within the direct path of discharge
 
Division 2
E
Pumps, compressors, gas-air mixers and vaporizers other than direct fired
 
 
 
 
 
Indoors without ventilation
 
Entire room and any adjacent room not separated by a gastight partition
 
Division 1
 
 
 
Within 15 feet of the exterior side of any exterior wall or roof that is not vaportight or within 15 feet of any exterior opening
 
Division 2
 
Indoors with adequate ventilation4
 
Entire room and any adjacent room not separated by a gastight partition
 
Division 2
 
Outdoors in open air at or above grade
 
Within 15 feet in all directions from this equipment and within the cylindrical volume between the horizontal equator of the sphere and grade (See Figure H-1)
 
Division 2
F
Service station dispensing units
 
Entire space within dispenser enclosure, and 18 inches horizontally from enclosure exterior up to an elevation 4 ft. above dispenser base. Entire pit or open space beneath dispenser
 
Division 1
 
 
 
Up to 18 inches above grade within 20 ft. horizontally from any edge of enclosure
 
Division 2
 
 
 
Note: For pits within this area, see Part F of this table
 
 
G
Pits or trenches containing or located beneath LP-gas valves, pumps, compressors, regulators, and similar equipment
 
 
 
 
 
Without mechanical ventilation
 
Entire pit or trench
 
Division 1
 
 
 
Entire room and any adjacent room not separated by a gastight partition
 
Division 2
 
 
 
Within 15 feet in all directions from pit or trench when located outdoors
 
Division 2
 
With adequate mechanical ventilation
 
Entire pit or trench
 
Division 2
 
 
 
Entire room and any adjacent room not separated by a gastight partition
 
Division 2
 
 
 
Within 15 feet in all directions from pit or trench when located outdoors
 
Division 2
H
Special buildings or rooms for storage of portable containers
 
Entire room
 
Division 2
I
Pipelines and connections containing operational bleeds, drips, vents or drains
 
Within 5 ft. in all directions from point of discharge
 
Division 1
 
 
 
Beyond 5 ft. from point of discharge, same as Part E of this table
 
 
J
Container filling
 
 
 
 
 
Indoors without ventilation
 
Entire room
 
Division 1
 
Indoors with adequate ventilation4
 
Within 5 feet in all directions from connections regularly made or disconnected for product transfer
 
Division 1
 
 
 
Beyond 5 feet and entire room
 
Division 2
 
Outdoors in open air
 
Within 5 feet in all directions from connections regularly made or disconnected for product transfer
 
Division 1
 
 
 
Beyond 5 feet but within 15 feet in all directions from a point where connections are regularly made or disconnected and within the cylindrical volume between the horizontal equator of the sphere and grade (See Fig. H-1.)
 
Division 2
1
The classified area must not extend beyond an unpierced wall, roof, or solid vaportight partition.
2
See chapter 296-46 WAC, and chapter 296-306A WAC Part T.
3
When classifying the extent of a hazardous area, consider the possible variations in the spotting of tank cars and tank vehicles at the unloading points and the effect these variations of actual spotting point may have on the point of connection.
4
Ventilation, either natural or mechanical, is considered adequate when the concentration of the gas in a gas-air mixture does not exceed twenty-five percent of the lower flammable limit under normal operating conditions.
[Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-41047, filed 12/1/98, effective 3/1/99. WSR 97-09-013, recodified as § 296-307-41047, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-41047, filed 10/31/96, effective 12/1/96.]
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