Installation
14
333011D
Grounding
The following are minimum grounding requirements for
a basic electrostatic system. Your system may include
other equipment or objects which must be grounded.
Check your local electrical code for detailed grounding
instructions. Your system must be connected to a true
earth ground.
•
Pump:
ground the pump by connecting a ground
wire and clamp as described in your separate pump
instruction manual.
•
Electrostatic Air Assisted Spray Gun:
ground the
gun by connecting the Graco Grounded Turbine Air
Hose to the turbine air inlet and connecting the air
hose ground wire to a true earth ground. See
Check
Electrical Grounding,
page 14.
•
Air compressors and hydraulic power supplies:
ground the equipment according to the manufac-
turer's recommendations.
•
All air and fluid lines
must be properly grounded.
•
All electrical cables
must be properly grounded.
•
All persons entering the spray area:
shoes must
have conductive soles, such as leather, or personal
grounding straps must be worn. Do not wear shoes
with non-conductive soles such as rubber or plastic.
•
Object being sprayed:
keep the workpiece hang-
ers clean and grounded at all times. Resistance
must not exceed 1 megohm.
•
The floor of the spray area:
must be electrically
conductive and grounded. Do not cover the floor
with cardboard or any non-conductive material
which would interrupt grounding continuity.
•
Flammable liquids in the spray area:
must be
kept in approved, grounded containers. Do not use
plastic containers. Do not store more than the quan-
tity needed for one shift.
•
All electrically conductive objects or devices in the
spray area
including fluid containers and wash
cans, must be properly grounded.
•
Fluid and waste containers:
ground all fluid and
waste containers in the spray area. Do not use pail
liners unless they are conductive and grounded.
When flushing the spray gun, the container used to
catch the excess fluid must be electrically conduc-
tive and grounded.
•
All solvent pails:
use only approved, grounded
metal containers, which are conductive. Do not use
plastic containers. Use only non-flammable sol-
vents. Do not store more than the quantity needed
for one shift.
Check Electrical Grounding
Graco Part No. 241079 Megohmmeter is available as an
accessory to check that the gun is properly grounded.
1. Have a qualified electrician check the electrical
grounding continuity of the spray gun and turbine air
hose.
2. Make sure the turbine air hose (B) is connected and
the hose ground wire is connected to a true earth
ground (N).
3. Turn off the air and fluid supply to the gun. The fluid
hose must not have any fluid in it.
4. Measure the resistance between the turbine air inlet
fitting (TA) and a true earth ground (N).
a.
If using a black or gray turbine air hose,
use a
Megohmmeter to measure the resistance. Use
When operating the electrostatic gun, any
ungrounded objects in the spray area (people, con-
tainers, tools, etc.) can become electrically charged.
Improper grounding can result in static sparking,
which can cause a fire, explosion, or electric shock.
Ground all equipment, personnel, object being
sprayed, and conductive objects in or close to the
spray area. Resistance must not exceed 1 megohm.
Follow the grounding instructions below.
Megohmmeter Part No. 241079 (AA-see F
IGURE
8) is
not approved for use in a hazardous area. To reduce
the risk of sparking, do not use the Megohmmeter to
check electrical grounding unless:
The gun has been removed from the hazardous area
Or
All spraying devices in the hazardous area are turned
off, ventilation fans in the hazardous area are
operating, and there are no flammable vapors in the
area (such as open solvent containers or fumes from
spraying).
Failure to follow this warning could cause fire,
explosion, and electric shock and result in serious
injury and property damage.
