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9-1 Maintenance Requirements
General
A periodic maintenance schedule must be established to
obtain the best service from the switchgear. Under the
conditions of a clean and dry environment, a check of the
switchgear devices and all connections should be made once
every two years. Equipment subject to highly repetitive
operation or to a dusty or humid environment may require
more frequent maintenance.
A permanent record of all maintenance work should be kept.
The record should include a list of periodic checks and tests
made, the date they were made, the condition of the
equipment, and any repairs or adjustments that were
performed.
Maintenance
recognized safety practices, such as those contained in the
National Electric Safety Code, ANSI C2-1981 and in company
or other safety regulations.
WARNING: Solid insulation surrounding an energized
conductor and power apparatus must never be relied upon
to provide protection to personnel.
ADVERTISSEMENT: Il ne faut pas se fier à une isolation
solide entourant un conducteur mis sous tension et à la
puissance de l'appareillage pour fournir une protection aux
membres du personnel.
For specific information regarding the maintenance of circuit
breakers and Entellisys instrumentation, refer to the
instruction book furnished with each device.
9-2 Breaker and Instrument
Compartments
Periodic inspection of the circuit breaker is recommended at
least
once
a
year.
recommended where severe load conditions, dust, moisture or
other unfavorable conditions exist, or if the vital nature of
the load warrants it. Always inspect the breaker after a
short-circuit current has been interrupted.
Breakers
Test for Proper Operation
Test and inspect all circuit breakers for proper operation as
follows:
1. Operate each breaker while in the TEST position and
check all functions. This is particularly important for
breakers that normally remain in either the opened or
closed positions for long periods of time.
WARNING: Primary equipment must be completely de-
energized while tests on control circuits, etc. are being
conducted.
Be sure that all areas of feedback from
secondary circuits, as well as outside sources, are
disconnected.
ADVERTISSEMENT: Il faut que l'équipement primaire
soit complètement désamorcé lorsque des tests sont
employees
must
More
frequent
inspections
Entellisys Low Voltage Switchgear
effectués sur des circuits de contrôle, etc. Assurez-vous que
toutes les aires de rétroaction des circuits secondaires de
même que les sources extérieures soient débranchées.
2. Remove the breakers from their compartments to a
clean maintenance area. Close compartment door and
cover the breaker cutout to prevent access to live parts.
WARNING:
doing maintenance work on any devices, connections, bus
work, breaker or feeder cable compartments. This includes
de-energizing any connections to outside primary or
secondary sources, such as transformers, tie lines, etc.
ADVERTISSEMENT:
follow
all
l'équipement avant d'effectuer du travail de maintenance
dans les compartiments. Cela inclut le désamorçage de
toute connexion aux sources primaires et secondaires,
telles que les transformateurs et les interconnexions.
Checks After Breaker Is De-energized
At the time of inspection, the following checks should be
made after the breaker has been de-energized.
1. Manually operate the breaker several times, checking
for obstructions or excessive friction. Manual closing of
an electrically operated breaker may be performed by
the following two steps:
a. For the EG-32/40/50 frame breakers, raise the
breaker frame off the work surface to ensure the
spring discharge interlock is not depressed. To
charge the mechanism springs, pull the operating
handle down until it stops (about 90°) five-six times
for the EG-08/16/20 and eight times for the EG-
32/40/50 frame. The charge indicator will show
CHARGED on a yellow background.
are
b. Depress the CLOSE button on the front of the
breaker. The springs should discharge and, if the
latch is properly reset, the breaker will close.
2. Electrically operate the breaker several times to check
performance of the electrical accessories.
3. Visually check for loose hardware on the breaker. Also,
check the bottom of the compartment for any hardware
that has fallen from the breaker.
4. Remove and inspect the arc quenchers and contacts for
breakage or excessive burning.
5. Check insulating parts for evidence of overheating and
for cracks that indicate excessive thermal aging.
Refer to circuit breaker instruction manuals for detailed
maintenance instructions and information for replacement of
parts. See DEH-203, DEH-204, DEF-004 or DEF-005.
61
Chapter 9. Maintaining the Switchgear
De-energize equipment completely before
Désamorcer
complètement
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