S&C Instruction Sheet 681-510 23
Maintenance
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Components
No mechanical maintenance typically is required for S&C
Vista Underground Distribution Switch gear. However,
occasional inspection of the switchgear and exercising
of the load-inter rupter switches and fault interrupters is
recommended.
DANGER
When access to the bushings or high-voltage
components inside the switchgear tank is re quired
for inspection, service, or repairs, always observe
the precautions below.
Failure to observe these
precautions will result in serious personal injury
or death.
1. Access to switchgear must be restricted only to a
qualified person. See the “Qualified Persons”
section on page 2.
2. Always follow safe operating procedures and
rules.
3. Before touching any bushings or components
inside the switchgear tank, always dis connect
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, by visual
evidence of an open-circuit condition at the load-
interrupter switch or fault interrupter, or by
observing that the load-interrupter switch or fault
interrupter is grounded.
5. Test the bushings for voltage using the
Voltage
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 tank and pad-mounted
enclosure (if furnished) are properly grounded to
the station or facility ground. Do not return
equipment to ser vice unless such grounds are
properly made.
★
These recommendations may differ from company operating proce-
dures and rules. Where a discrepancy exists, users should follow their
company’s operating procedures and rules.
