GE Industrial Solutions EntelliGuard 800–2000 A Frames, 240–600 Vac Maintenance Manual - Manual (Page 11)

EntelliGuard™ 800–2000 A Power Circuit Breakers
Chapter 1. Introduction
1
1.1 Overview
These instructions describe the procedures for mainte-
nance and operation of EntelliGuard 800-2000 ampere
low-voltage power circuit breakers. Figure 1 is a front view
of the breaker, with key features indicated.
The proper use, care, and maintenance of these breakers
is important both from the safety aspect of protecting per-
sonnel and for minimizing equipment damage when
faults occur. Persons who apply, use, and service these
breakers should be familiar with the information pre-
sented in this publication.
WARNING: Before inspecting or beginning
any maintenance work on a circuit breaker, the
breaker must be in the OPEN position and dis-
connected from all voltage sources, both power
and control.
AVERTISSEMENT: Avant d’inspecter ou de
débuter tout travail de maintenance d’un dis-
joncteur, celui-ci dout être en position OPEN et
débranché de toutes les sources de voltage, à la
fois de puissance et de contrôle.
1.2 Inspection and Maintenance
Circuit breakers should be maintained under a systematic
program. Take each breaker out of service periodically for
inspection and maintenance to help establish high reli-
ability in service. This policy is facilitated by keeping one
or more spare breakers to install in place of breakers
requiring maintenance. Keeping a stock of recommended
renewal parts ensures that maintenance work can be done
quickly.
The frequency at which an individual breaker should be
inspected depends on the circumstances of its use. Table 1
lists the ANSI-recommended service interval with the GE-
recommended interval for EntelliGuard breakers.
EntelliGuard breakers should be inspected after every
short circuit interruption, after every number of ON-OFF
operations given in Table 1, or every two years, whichever
comes first. EntelliGuard breakers have been built and
tested to operate reliably with inspections at twice the
ANSI interval, thus saving time and money by reducing
breaker downtime.
Source of
Recommendation 800 A Frame
1600 and
2000 A Frames
ANSI 1750 500
EntelliGuard, no
load
3500 1000
EntelliGuard, at
frame rating
2800 800
Table 1. Recommended service intervals, in number of ON-OFF
operations, for EntelliGuard breakers.
If a breaker is installed in an area of high humidity or a
dusty atmosphere, it should be inspected more often.
Monthly inspections might be warranted for a breaker
operated under severe conditions.
Always inspect the breaker after it has interrupted a short
circuit or ground fault.
A standard inspection should consist of the following
steps:
1. Visual Check – Look for dirt, grease, or other
foreign material on all breaker parts. Check
insulating surfaces for conditions that could
degrade insulating properties, such as cracks or
evidence of overheating. Check for foreign objects
on the bottom of the breaker compartment. Check
for loose or damaged control wiring and for similar
problems.
2. Operation – Observe a few close-open operations
using the operating handle. If a breaker is seldom
operated, such that it remains open or closed for six
months or more, open and close the breaker several
times in succession.
3. Interlocks – During the operational check, verify
that the safety interlocks are working properly.
4. Arc Chutes and Contacts – Inspect the arc chutes
and contacts for excessive burning or breakage.
Check the amount of contact depression or wipe
when the breaker is closed.
5. Accessories – Verify that the various accessories are
working properly.
1.3 Renewal Parts
Many of the parts and assemblies contained in
EntelliGuard breakers are available as replacement parts.
See DEF004 for a complete listing.