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S-3
i.
Take personal responsibility to assure that no one can turn on the high voltage
circuits when you are working on the equipment. Precautions would include taping
down (or installing a keeper) on controls/circuit breakers and/or disconnecting the
power source to the high voltage circuits, activating interlocks that prevent high
voltage turn on, etc. Know where the power disconnects are and use them. Do NOT
rely on anyone not to turn on the high voltage.
j.
Set up your test equipment with the power off. Conduct the power-on operations
when you have your hands out of the equipment.
k.
Do not use short probes for high voltage measurements. A short probe does not
allow any margin for error. If your hand slips you could accidentally come into contact
with a danger point. A long probe avoids the whole problem.
l.
Read the instruction manual. The best insurance is foreknowledge of hazards.
m.
Create a favorable environment for safe operations. This means that if people are
crowding you, stop the operation if it involves high voltage. Pressure can lead to
carelessness. In the same way, fatigue is also an enemy. STAY ALERT AT ALL TIMES
WHEN WORKING WITH HIGH VOLTAGE.
n.
Do not become over-confident. Maintain a healthy respect for high voltage.
o.
A good operating practice is to check the potential between the equipment chassis
and earth ground before you complete the circuit with your body. As voltage levels
increase, the protection you get from insulation and air gap diminishes. For example,
in a piece of equipment that involves beam voltages of about 16kV, the beam
transformers look very safe with massive insulation on the outside of the coils.
Physical contact with the beam coil when the system is operating can be fatal.
Although the equipment is placard to warn people of the presence of high voltage, it is
virtually impossible to placard every point of danger in a system.
p.
If you do not know how the equipment works and what the hazards associated with
the equipment are in specific terms, do NOT handle the equipment. The greatest
protection you can have when dealing with high voltage equipment is specific detailed
knowledge on that particular piece of equipment.
q.
Avoid "haywire" test setups. It is easy to get in trouble if the setup you are using has a
jumble of wires.
r.
Make sure your connections are secure. Do NOT allow leads to slip off and move
about in an uncontrolled fashion. Even if it is not one of the high voltage leads, a free
lead could (and generally does) move exactly to where you do not want it. The only
safe connection is a mechanically secure one.
s.
Watch out for unterminated high voltage leads. Some connectors depend on circuit
loading to avoid arcing between closely spaced terminals. Unloaded high voltage lines
or plugs can lead to arcing situations.
