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CHPA S
ERIES
General Guidelines
In addition to the above, the following practices are proven effective for personnel who deal
with high voltage equipment.
a. Hands off. Avoid contact with potential sources of high voltage. Keep hands out of the
equipment when it is operating.
b. Create a favorable environment for safe operations. It is easy to forget high voltage
hazards when distracted. Stop all high voltage work when there is a crowd of people
around.
Check and remove trip hazards in the area.
equipment when tired or on medication that may cloud judgment or perception. Make sure
pens, jewelry, and employee badges do not come in contact with high voltage equipment.
c. Never work on high voltage circuits alone. Be sure the person watching knows what to do
in an emergency (e.g., how to shut equipment off, first aid, who to call, etc.)
d. Use the one hand when working with high voltage circuits. Many people recommend that
one hand be put in a pocket or behind the back when using a probe or other piece of
equipment inside a high voltage section. Receiving a shock through the right hand keeps
the path of damage away from the heart.
e. Do not float measuring equipment above ground. Make all measurements with respect to
ground.
f.
Discharge high voltage capacitors. High voltage capacitors store a lot of energy for long
periods of time. High voltage capacitors can recover high voltage after discharge and reach
lethal levels.
g. Do not depend on the automatic features to save you. It is difficult to tell if a circuit is
disabled. Component errors or miss wiring can disable the function of built in safety
features. Each and every time a piece of high voltage equipment is powered on, use a
discharging device with a long handle to discharge all high voltage capacitor.
h. Take personal responsibility to assure that equipment is tagged and locked out so high
voltage cannot be turned on during service. Precautions include a lock on circuit breakers,
disconnecting the high voltage power source, and using interlocks that prevent high voltage
turn on. Know where power disconnects are and use them. DO NOT rely on others to turn
off the high voltage and make sure equipment is tagged and locked out.
i.
Set up test equipment with the power off. Double check power cords for cracks or breaks
before powering on equipment. Apply power to the unit when the operator's hands are out
of the equipment.
j.
Use probes rated for high voltage measurements. The voltage rating of the probe should
exceed the maximum possible voltage at the test point. Length of the probe should be
adequate to prevent accidental contact of the circuitry
k. Do not become over-confident.
Equipment may be dangerous to the operator unless proper safety and operation practices
are observed.
S-2
Always maintain a healthy respect for high voltage.
THIS DOCUMENT IS THE PROPERTY OF COMMUNICATIONS & POWER INDUSTRIES.
REPRODUCTION OR RELEASE WITHOUT EXPRESS PERMISSION IS STRICTLY PROHIBITED
Do not operate high voltage
D
.01023245 R
OC
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EV
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