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25
Maintenance
01.4IB.26263B
5) Control Contacts
Contacts should be inspected and dressed
or replaced when the surface becomes
seriously pitted. Unless repetitive duty has
been experienced, little attention should be
required.
6) Secondary Wiring
Check all wiring connections for tightness,
including those at the current and potential
transformers and at the terminal blocks
where circuits leave the switchgear. Ensure
that the secondary wiring connections
are properly connected to the switchgear
ground bus.
7) Mechanical Parts
Visually check and manually operate
mechanical moving parts such as optional
shutters, TOC, and MOC assemblies.
Examine mechanical mating parts such as
the levering-in arms and the mating guide
channels.
8) Ventilation
Check all labyrinths, grillwork, and
air passages for obstructions and
accumulations of dirt. The air space around
the switchgear, which is necessary for
the entrance of ventilating air, should be
cleaned of possible debris.
9) Battery and Charging Equipment
The control battery is such an important
accessary to the switchgear operation
that it must be given special periodic
attention if it is to have a long life of reliable
service. Periodic inspections and test are
recommended in the battery supplier’s
instructions. During the same time that
the battery is routinely checked, inspect
the battery charger and remove any
accumulations of dust and dirt.
10) Hardware
Check to see all anchor bolts and
switchgear hardware are tightened to
correct torque values. See
Torque Values for PowlVac Low Voltage
.
11) Heaters
If the switchgear is equipped with
anti-condensation heaters, check to see
that all heaters are energized and operating
properly. This may be done by using a
hook-on ammeter to measure the current
drawn by the heater.
