Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › SPECIALIZED OPERATIONS › Part U-2 - Hazardous Materials - Liquified Petroleum Gas › Section 296-307-41047 - Electrical requirements that apply to LP-gas installations

Current through Register Vol. 24-14, July 15, 2024
(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
							 area
1
Equipment must be
suitable for Class
							 I, Group D
2
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
Division 2
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
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.
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					 image
Statutory Authority:
						RCW
						 49.17.040. 98-24-096, § 296-307-41047,
						filed 12/1/98, effective 3/1/99. 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 .
						96-22-048, § 296-306A-41047, filed 10/31/96, effective
						12/1/96.