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Interlocks and other safety devices must NOT be
and artificial ventilation instructions posted in their
altered or disconnected, except for replacement, and
vicinity. Switchboards, switchgears, and their access
must NOT be modified without specific authority
doors must also have DANGER HIGH VOLTAGE
from the cognizant systems command. Periodic tests
signs posted.
and inspections must be made to ensure the devices
When removing or installing switchboard and
are functioning properly.
control panel meters and instrument transformers, you
must be extremely careful to avoid electrical shock to
yourself and damage to the transformers and meters.
The secondary of a current transformer MUST be
Before you start working on de-energized circuits
short-circuited before you disconnect the meter. An
that have capacitors installed, you must discharge
extremely high voltage buildup could be fatal to
them with a safety shorting probe. When using a safety
unwary maintenance personnel and it could damage
shorting probe, first connect the test clip to a good
the current transformer.
ground to make contact. If necessary, scrape the paint
off the metal surface. Then, hold the safety shorting
The primary of a potential transformer must be
probe by the handle and touch the probe end of the
opened before you remove the meter to prevent
shorting rod to the points to be shorted. The probe end
damage to the primary circuit due to high circulating
can be hooked over the part or terminal to provide for
a constant connection to ground. Never touch any
In most installations, potential transformer
metal parts of the shorting probe while grounding
primaries are fused, and the transformer and
circuits or components. It pays to be safe--use the
associated meter cart be removed after you pull the
safety shorting probe with care.
fuses for the transformer concerned. When dis-
connecting the transformer and meter leads, you
should avoid contact with nearby energized leads and
NOTE
terminals.
Capacitors not electrically connected to
INTERLOCKS
the chassis ground must have their terminals
shorted together to discharge than by the
use of a shorting probe.
Many modern electronic equipments are provided
with various built-in safety devices, such as interlock
switches, to prevent technical and maintenance
RUBBER GLOVES
personnel from coming into contact with electrical
potentials in excess of 70 volts rms or dc. However,
There are four classes of rubber insulating
some of these protective devices are removed or
gloves--class 0, class I, class II, and class III. The
destroyed by personnel who tamper with, block open,
or otherwise "override" them. The foregoing practices
primary feature of each class is the wall thickness of
the gloves and the maximum safe voltage. These
must NOT be performed unless authorized by the
features are identified by a color label on the glove
commanding officer for operational reasons. Then the
sleeve. Only use rubber insulating gloves that are
equipment must be properly tagged to notify
marked with a color label. Table 1-1 contains the
personnel of this condition.
Table 1-1.--Rubber Gloves
LABEL COLOR
MAXIMUM SAFE VOLTAGE
CLASS
Red
1,000
volts
0
White
7,500
volts
I
Yellow
17,000
volts
II
Green
26,500
volts
III

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