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Wiring and terminals check
1. Physically check all of the circuit breaker
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.
Secondary-disconnect check
In addition to checking the terminals of the
secondary disconnect, the secondary contact
fingers need to be free to move without
binding. Depress each finger, confirm
presence of spring force (contact pressure)
and verify freedom-of-motion.
Hazardous voltage and high-speed moving parts.
Will cause death, serious injury and property damage.
Read instruction manuals, observe safety instructions and use
qualified personnel.
Automatic spring-charging check (control
power required)
Repeat the automatic spring-charging check
described in "Installation checks and initial
functional tests" (refer to page 13).
Primary tasks of this check are:
1. The circuit breaker is energized with
control power for this check.
2. De-energize the source of control power.
3. Install the circuit breaker end of the split-
plug jumper over the secondary
disconnect of the circuit breaker. The split-
plug jumper has one male and one female
connector and cannot be installed
incorrectly (refer to Figure 5: Split-plug
jumper connected to circuit breaker on
page 13).
4. Install the switchgear end of the split-
plug jumper over the secondary-
disconnect block inside the switchgear
(refer to Figure 6: Split-plug jumper
connected to switchgear on page 13).
5. Energize the control-power source.
6. When control power is connected to the
circuit breaker, the closing springs should
automatically charge. Visually verify the
closing springs are charged.
Note: A temporary source of control power
and test leads may be required if the control-
power source has not been connected to the
switchgear. When control power is connected
to the type GMSG vacuum circuit breaker, the
closing springs should automatically charge.
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