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I.B. 3A74792H08
SECTION 6: INSPECTION, MAINTENANCE
AND TROUBLESHOOTING
6-1 INTRODUCTION
DO NOT WORK ON A CIRCUIT BREAKER IN THE
"CONNECTED" POSITION.
DO NOT WORK ON A CIRCUIT BREAKER WITH
SECONDARY DISCONNECTS ENGAGED.
DO NOT WORK ON A CIRCUIT BREAKER WITH
SPRINGS CHARGED OR CONTACTS CLOSED.
DO NOT DEFEAT ANY SAFETY INTERLOCKS.
DO NOT LEAVE MAINTENANCE TOOL IN THE
SOCKET AFTER CHARGING THE CLOSING
SPRINGS.
DO NOT STAND LESS THAN FOUR METERS
AWAY FROM THE BREAKER WHEN TESTING
FOR VACUUM INTEGRITY.
FAILURE TO FOLLOW ANY OF THESE
INSTRUCTIONS MAY CAUSE DEATH, SERIOUS
BODILY INJURY, OR PROPERTY DAMAGE. SEE
SECTION 2-SAFE PRACTICES FOR MORE
INFORMATION.
6-2 FREQUENCY OF INSPECTION AND
MAINTENANCE
Periodic inspections and associated maintenance are
essential to the safe and reliable operation of VCP-W and
VCP-WR Vacuum Circuit Breakers. The inspection
frequency and associated maintenance recommended
are intended to insure the best possible ongoing service.
It is imperative that an established schedule be followed.
To establish an exact schedule for a specific installation,
use the following guidelines:
1. In a clean, non-corrosive environment, inspect and
maintain each circuit breaker annually or every 500
operations, which ever comes first.
2. For special conditions such as frequent circuit breaker
operation, contaminated environments, and high
temperature/humidity conditions, the inspection
frequency should be twice a year.
3. Inspect a circuit breaker every time it interrupts fault
current.
Effective
0 9 / 2 0 14
WARNING
4. Follow the steps presented in Paragraph 6-3
entitled "Inspection and Maintenance Procedures"
for scheduled programs.
5. Create and maintain a dated permanent record of
all inspections, maintenance performed, actions
taken, observations made, and measurements
taken. Not only will this provide valuable historical
information, it can help to establish whether or not
the present schedule needs to be adjusted.
6. Perform ongoing visual inspections, when
possible, of all equipment on a regular basis. Be
alert for an accumulation of dirt in and around the
circuit breakers, loose hardware or discolored
insulation.
6-2.1 QUALIFIED PERSONNEL
For the purpose of operating switchgear equipment
and associated circuit breakers, only individuals
thoroughly trained in the operation of power circuit
breakers and associated equipment, and having
knowledge of connected loads may be considered to
be qualified. Refer to further definitions in the
National Electrical Safety Code.
For the purpose of inspecting and maintaining such
equipment, a qualified person must also be trained in
regard to the hazards inherent to working with
electricity and the proper way to perform such work.
Such an individual should be able to de-energize,
clear and tag circuits in accordance with established
safety practices. In addition, these individuals should
have access to and be trained in the use of protective
equipment, such as rubber gloves and flash clothes.
All personnel should be familiar with and understand
the material presented in this instruction manual and
other related manuals.
6-2.2 HELPFUL TOOLS AND ACCESSORY ITEMS
To simplify the performance of inspection and
maintenance programs, the items described in Section
3-5 are recommended.
6-2.3 GENERAL TORQUE GUIDELINES
Bolts and screws must be properly torqued. This is
especially true if parts and/or accessories are added
or replaced. Table 6.1 provides guidelines on torque
levels. The table is intended as a general guideline
Page 33
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