PRE-ENERGIZATION CHECK
Page 37
ELECTRICAL CHECKS
With incoming power isolated and all
loads disconnected electrically, the
control circuit and other mechanisms
should be exercised to determine that
the devices operate properly. An
auxiliary source of control power will be
necessary to provide power to the
electrical operators (Fig. 45).
Electrical shock hazard.
Do not touch energized
components during a test
using auxiliary power.
The ground fault protection system (if
furnished) should be tested in
accordance with the instructions
furnished with the device.
An electrical insulation test should be
performed to ensure that the controller
and associated field wiring are free
from short circuits and grounds. The
preferred method is to perform a
dielectric test at 2.25 times the nominal
system voltage plus 2000 volts. This
should be done phase-to-ground,
to-phase and phase-to-neutral
(if
applicable), with all switches and circuit
breakers opened. Disconnect any
devices which may have limited
dielectric strength and that are not
intended for this test.
The light or buzzer, or both, used to
indicate breakdown should be calibrated
to indicate failure with an output
current between 1.5 and 2.0
milliamperes per 1000 volts applied.
Hazardous voltages are
present during dielectric
testing which can result
in serious injury or death.
High potential tests
should be performed only
by qualified personnel.
Refer to safety
instructions provided
with the test equipment.
All devices must be set to their normal
or OFF position before energizing
incoming power.
Fig. 45 Using Test Power Source
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