24 S&C Instruction Sheet 662-510
Components
No mechanical maintenance is required for S&C Manual
PMH Pad-Mounted Gear. However, occasional inspection
of the gear and exercising of the Mini-Rupter Switches is
recommended. In addition, inspection and cleaning—of
insulators and cable terminators in particular—should
be performed periodically, at intervals based on environ-
mental conditions. Refer to S&C Instruction Sheet 662-590,
“Inspection Recommendations.”
Before gaining access to high-voltage compartments,
if required, refer to the “DANGER” message on page 7.
CAUTION
When, in the user’s judgment, cleaning is required,
S&C recommends the pad-mounted gear be
completely de-energized and properly grounded
according to the user’s operating and safety
procedures, and thoroughly cleaned by hand. If it
is not possible to de-energize the gear, the use of
pressure sprayed dry ice (solid CO
2
) is an acceptable
alternative cleaning method. The use of pressure
sprayed abrasives or solvents is specifically not
recommended because such abrasives or solvents
will damage switch and fuse components.
WARNING
Dual-purpose front barriers for switch and fuse
com partments should be inserted into the open gap
of the Mini-Rupter Switch or fuse to provide physical
isola tion for additional security in the event it is
neces sary to work on the cables connected to the
Mini-Rupter Switch or fuse.
Returning Equipment to Service
When returning the equipment to service, observe the
following procedures :
STEP 1. Make sure switch and fuse grounding means
are removed and that dual-purpose front
barriers are removed from the “Slide-in”
position before closing the associated
Mini-Rupter Switch or power fuses.
STEP 2. Make sure the Mini-Rupter Switches are in the
correct positions (Open or Closed) as dictated
by sys tem circumstances.
STEP 3. Close each door permitting access to high
voltage and make sure the associated Penta-
Latch Mechanisms are securely latched before
energizing the circuit or operating any switching
device.
STEP 4. Padlock all doors and switch-operating-shaft
access covers before leaving the installation
site, even momentarily. Observe this procedure
even in those cases where the gear is accessible
only to qualied per sons.
é These recommendations may differ from the user’s operating and
safety procedures. Where a discrepancy exists, users should follow
their procedures.
Maintenanceé
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