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S-4
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 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 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 fore-
knowledge 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.
S A F E T Y
Installation and Operation Manual
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