S&C Instruction Sheet 695-545
19
Maintenance
Inspection Recommendations
No mechanical maintenance is required for S&C Vista
SD Underground Distribution Switchgear. However,
occasional inspection and cleaning of the switchgear
and exercising of the load-interrupter switches and fault
interrupters is recommended. Refer to S&C Instruction
Sheet 695-590, “S&C Vista® SD Underground Distribution
Switchgear:
Inspection Recommendations.
”
DANGER
When access to the bushings on S&C Vista SD
Underground Distribution Switchgear is required for
inspection, service, or repairs, always observe the
following precautions. Failure to observe these pre-
cautions will result in serious personal injury or death.
1. Access to the switchgear must be restricted only to
qualified persons. See “Qualified Persons” on page 2.
2. Always follow safe operating procedures and rules.
3. Before touching any bushings, always disconnect
the load-interrupter switches and fault interrupters
from all power sources (including backfeed), test
for voltage, and properly ground.
4. Always assume the bushings are energized unless
proved otherwise by test or by visual evidence of an
Open-Circuit condition at the isolating disconnect.
5. Test the bushings for voltage using the
Potential
Indication feature (if furnished) or other proper
high-voltage test equipment.
6. After the switchgear has been completely
disconnected from all sources of power and tested
for voltage, ground all load-interrupter switches
and fault interrupters.
7. Make sure the switchgear and pad-mounted
enclosure (if furnished) are properly grounded to
the station or facility ground. Do not return
equipment to service unless such grounds are
properly made.
Inspecting Cable Terminations
Cable terminations can be inspected visually or by using
a noncontact infrared thermometer to check temperature.
To remove cables or cable accessories, the enclosure shelf
will need to be removed. This can be done by clearing the
shelf of any items and unscrewing the hand bolts at the
four corners of the shelf. See Figure 26.
Figure 26. Location of the hand bolts on the shelf for shelf
removal (if necessary).
Hand bolts
