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Maintenance
Racking Mechanism
Racking mechanism is to be wiped clean, and lubricant
applied on sliding, rotating, and articulating surfaces.
MOC Actuator System
Reference Figure 8.
MOC Actuator System should be inspected — refer to Table
2, "Periodical Maintenance and Lubrication Tasks".
Maintenance of the circuit breaker MOC actuator system
DOES NOT mitigate the requirement to maintain cubicle
mounted MOC system components. These shall be main-
tained in accordance with the original equipment
manufacturer's recommendations.
Electrical Control Checks
Check of the Wiring and Terminals
1. Physically check all of the switchgear wiring for evidence
of abrasion, cuts, burning or mechanical damage.
2. Check all terminals to be certain they are solidly attached
to their respective device.
Table 2. Periodic Maintenance and Lubrication Tasks
Sub-Assembly
Primary Power Path
Electrical Controls
High Potential Test
Insulation
Interrupter Operator
Mechanism
Racking Mechanism and
Interlocking System
MOC Actuator System
(Refer Figure 8)
Item
Primary Disconnects
Wiring
Terminals and Connectors
Close and Trip Solenoids, Anti-
Pump Relay, Auxiliary Switches,
Secondary Disconnect
Primary Circuit to Ground
and between Primary Dis-
connects
Control Circuit to Ground
Barriers and all Insulating
Components
Refer to Circuit Breaker Operator Manual.
1. Excessive wear and/or mechanical damage on components or
any mechanical joints.
2. Loose hardware.
Electrical Close and Trip Check (Control Power Required)
A check of the circuit breaker control circuits shall be per-
formed. This check is made with the circuit breaker ener-
gized by control power either from the switchgear or an
external control power source.
1. Once the circuit breaker springs are charged, move the
switchgear Close/Trip switch to the Close position. There
should be both the sound of the circuit breaker closing
and indication that the circuit breaker contacts are closed
by the main contact status indicator.
2. As soon as the circuit breaker has closed, the automatic
spring charging process is repeated.
3. After a satisfactory close operation is verified, move the
switchgear Close/Trip switch to the Trip position. Verify
by both sound and contact position that the contacts
are open.
4. After a satisfactory open operation is verified, hold the
circuit breaker manual Trip button and apply and main-
tain an electrical close signal. The circuit breaker should
close, immediately trip, the close spring should charge,
and the circuit breaker should not attempt to close.
Completion of these checks demonstrates satisfactory op-
eration of auxiliary switches, internal relays and solenoids.
Inspect For
1. Burnt or damaged fingers
2. Lubrication of contact surfaces.
3. Tightness of nuts (torque 1/2" Grade 5 bus
hardware to 50 ft.-lbs.) and other locking devices.
1. Mechanical damage or abrasion
1. Tightness and absence of mechanical damage
1. Automatic charging
2. Close and trip with control power
1. 60 second withstand, refer to Circuit Breaker
Operator Manual SGIM-9918 for ratings.
1. 60 second withstand, refer to Circuit Breaker
Operator Manual SGIM-9918 (3AH) or
SGIM-3398 (3AF) for ratings.
1. Cleanliness
2. Cracking, crazing, tracking, or other sign
of deterioration
1. Cleanliness
2. Lubrication of sliding, rotating, and
articulating surfaces. Apply Anderol 732
aerosol synthetic fluid grease
(part number 15-172-816-058) or
Beacon #325 (part number 15-337-131-001).
Lubrication Interval
10 years
100 racking operations
10 years or
10,000 operations
10 years or
100 racking
operations
10 years or
2,000 operations
11
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