AH-95-02.4
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Operations Near Computers or
Operations Near Computers or
Operations Near Computers or
Operations Near Computers or
Operations Near Computers or
Other Electronic Devices
Other Electronic Devices
Other Electronic Devices
Other Electronic Devices
Other Electronic Devices
For over 35 years, the No. 2 Process Handgun
has been the most widely used tool by the on-
site painting industry for the refinishing of office
furniture, office panels, lockers, school furniture,
and dozens of other items.
Quite often we are asked about the dangers and
possible damage to computers, phone systems,
word processors, and electronically keyed
security systems when electrostatic painting is
done nearby.
Concerning those types of applications or any
microprocessor base equipment, the following
facts should be noted:
1.
The No. 2 Process Handgun is not elec-
tromagnetic. It is electrostatic (much
like the static from carpets or wool and
synthetic clothing), and works at an out-
put of 100 kilovolts at 30-50 microam-
peres current draw. (100 microamperes
maximum short circuit current).
Grounding of all conductive objects
near an electrostatic spray gun is of the
highest importance.
N O T E
N O T E
N O T E
N O T E
N O T E
2.
Unlike x-rays, electrostatic does not go
"through" objects.
3.
Some computers, phone systems, or
word processors are now shielded by
the manufacturer against outside static.
4.
If the static shielding of a unit is unknown,
the keyboard, CPU (central processing
unit), monitor, or phone and its cable
preferably should be removed from the
immediate painting area for protection of
the device. If this is not feasible, they
should be completely wrapped in
aluminum foil that is grounded to an earth
ground. This will create a "Faraday cage"
around the computerized device.
5.
Electrical sparks of all types create an
R.F. energy (radio frequency) that may
radiate through the air and enter into
electronic circuits. The resulting damage
is unpredictable.
6.
Computer software such as tapes, disks,
diskettes, etc., should be removed from
inside of and from the immediately
surrounding area of any enclosures that
are to be painted.
7.
Lightning or electrostatic voltage sparking
into an A.C. circuit can create "spikes" or
electromagnetic pulse (EMP) that can
cause unpredictable damage to electronic
hardware.
8.
Surge suppressors are available that may
help protect appliances from "spikes" of
current if the suppressor is in the A.C. line
supplying the appliance.
9.
When painting any type of electrical
control panel or console it is generally not
known if all push-button, switches,
meters, or pilot lights are properly
grounded. In view of this, it is desirable to
cover all of these items with aluminum foil
which is grounded to the panel or another
earth ground.
10.
All on-site painting companies should
have adequate liability insurance to
protect them in the event of any real or
perceived damage as a result of their
operations.
In view of the above unknown and possible
uncontrolled conditions, ITW does not
recommend the electrostatic spray painting of
computer cabinets, consoles, or painting in
close proximity to these devices.
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