52
Continued
Contact and hinge spring and shunts
Check pressure springs in contact and hinge and replace, if
not adequate; replace flexible shunts, if frayed.
not adequate; replace flexible shunts, if frayed.
Blade latches and stops
See that blade latches, where provided, are engaged; check
latches for proper engaging and holding blade against
opening force. See that stops are in place and tight.
latches for proper engaging and holding blade against
opening force. See that stops are in place and tight.
Arcing switch blades and contacts
Do not lubricate.
Arc chutes or interrupter device
Check for condition, alignment, and proper operation.
Switch operating mechanism and
linkage
linkage
Adjust for adequate contact closure and over travel;
lubricate.
lubricate.
Operating rods, levers, and cranks
Check and tighten bolts, screws, and locknuts; see that
rods, levers, and cranks are in serviceable condition and
repair as necessary; lubricate pivot points and bearings.
rods, levers, and cranks are in serviceable condition and
repair as necessary; lubricate pivot points and bearings.
Gearboxes
Check gears and bearings; flush out oil or grease and
relubricate.
relubricate.
Operating motor and mechanism Check motor operation and
perform insulation resistsance
test; check adjustment of brake.
Auxiliary and limit switches
Check condition of contacts and refinish with fine file if
burned or corroded; check contact springs, operating rods,
and levers; check closing and opening positions with respect
to main switch contacts or travel or motor mechanism.
burned or corroded; check contact springs, operating rods,
and levers; check closing and opening positions with respect
to main switch contacts or travel or motor mechanism.
Door and other interlocks
Functional test for proper sequence.
Switch disconnect studs and finger
clusters (if drawout type)
clusters (if drawout type)
Lubricate unless manufacturer's instruction says not.
Cable terminations and connections
Clean and inspect for surface tracking; check connections
for correct tightness.
for correct tightness.
Meters
Check calibration.
Fuse clips and fuses
Check clips for adequate spring pressure and proper fuse
rating.
rating.
Grounding
Check base and operating handle ground connections; see
that ground cable is not broken.
that ground cable is not broken.
Potential, current, and control
transformers
transformers
Evaluate and make necessary repairs.
Switch sticks
See that switch-operating sticks are in good condition and
are kept in a dry place; inspect sticks for damage and
deterioration; discard suspect switch sticks; test sticks per
requirements under FIST Volume 4-1B, Personal Protective
Equipment.
are kept in a dry place; inspect sticks for damage and
deterioration; discard suspect switch sticks; test sticks per
requirements under FIST Volume 4-1B, Personal Protective
Equipment.
References
FIST Volume 3-18, Replacing Glaze Burned Insulators