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Doc. 01031254 Rev. 1
c. Never work on high voltage circuits when you are alone. If
anything should happen to you, your only chance may be
prompt action by some other person. Be sure someone else
is present and knows what to do in any emergency (e.g.,
how to shut equipment off, first aid, who to call, etc.)
d. Use one hand when working with high voltage circuits.
Many people recommend that you put one hand in your
pocket when you use a probe or other piece of equipment
inside a high voltage section.
e. Do not float measuring equipment above ground. Make all
measurement with respect to ground. If you float an
instrument, you may forget and reach inside the equipment.
Although it is more difficult to get the right setup, it is well
worth the effort.
f. Do not assume that the level of risk is a function of size.
Some large high power voltage equipment looks docile. One
reason the equipment is so big is to get the proper separation
between high voltage points. On the other hand, just
because the equipment is small is no assurance of safety.
Dense packaging results in more difficult access and
increases the chance that you will accidentally hit the wrong
point.
g. Always discharge high voltage capacitors. High voltage
capacitors store a lot of energy for long periods of time.
High voltage capacitors also exhibit a "memory" in that they
can recover after discharge and reach lethal levels. In
addition to the "memory" problem, there have been
instances where the built-in safety features have failed or
been miswired. Each and every time you go to work on a
piece of high voltage equipment, use a grounding rod with
a long handle to discharge every high voltage capacitor.
h. Do not depend on the automatic features of the equipment
to save you. You never know when someone has left a
circuit disabled, if there has been a wiring error, or if a
component has failed.
M P A H U B M O U N T
S-3
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