Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-24 - General safety and health standards › Part E - HAZARDOUS MATERIALS, FLAMMABLE LIQUIDS, SPRAY FINISHING › Hazardous Materials › Section 296-24-37017 - Electrostatic hand spraying equipment

Current through Register Vol. 24-14, July 15, 2024
(1)
Application.
This section must apply to any equipment using
				  electrostatically charged elements for the atomization and/or, precipitation of
				  materials for coatings on articles, or for other similar purposes in which the
				  atomizing device is hand held and manipulated during the spraying
				  operation.
(2)
Conformance.
Electrostatic hand spraying equipment must conform
				  with the other provisions of WAC
				  296-24-370 through
				  296-24-37027.
(3)
Equipment approval and
				  specifications.
Electrostatic hand spray apparatus and devices used in
				  connection with coating operations must be of approved types. The equipment
				  should be so designed that the maximum surface temperature of the equipment in
				  the spraying area must not exceed 150°F under any condition. The high
				  voltage circuits must be designed so as to not produce a spark of sufficient
				  intensity to ignite any vapor-air mixtures nor result in appreciable shock
				  hazard upon coming in contact with a grounded object under all normal operating
				  conditions. The electrostatically charged exposed elements of the handgun must
				  be capable of being energized only by a switch which also controls the coating
				  material supply.
(4)
Electrical support equipment.
You must locate transformers,
				  powerpacks, control apparatus, and all other electrical portions of the
				  equipment, with the exception of the handgun itself and its connections to the
				  powder supply outside of the spraying area or they must otherwise conform to
				  the requirements of WAC
				  296-24-37005.
(5)
Spray gun ground.
You must
				  electrically connect the handle of the spraying gun to ground by a metallic
				  connection and to be so constructed that the operator in normal operating
				  position is in intimate electrical contact with the grounded handle.
(6)
Grounding-General.
You must
				  adequately ground all electrically conductive objects in the spraying area .
				  This requirement must apply to paint containers, wash cans, and any other
				  objects or devices in the area. The equipment must carry a prominent
				  permanently installed warning regarding the necessity for this grounding
				  feature.
(7)
Maintenance of
				  grounds.
You must maintain objects being painted or coated in metallic
				  contact with the conveyor or other grounded support. You must regularly clean
				  hooks to ensure this contact and areas of contact must be sharp points or knife
				  edges where possible. You must conceal points of support of the object from
				  random spray where feasible and where the objects being sprayed are supported
				  from a conveyor, you must locate the point of attachment to the conveyor so as
				  to not collect spray material during normal operation.
(8)
Interlocks.
The electrical
				  equipment must be so interlocked with the ventilation of the spraying area that
				  the equipment cannot be operated unless the ventilation fans are in
				  operation.
(9)
Ventilation.
The spraying operation must take place within a spray
				  area which is adequately ventilated to remove solvent vapors released from the
				  operation.
Order 73-5, § 296-24-37017, filed 5/9/73 and Order
						73-4, § 296-24-37017, filed 5/7/73.