S&C Instruction Sheet 695-510
21
Maintenance
Components
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 Under-
ground Distribution Switchgear is required for inspection,
service, or repairs, always observe the following precau-
tions . Failure to observe these precautions 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 volt-
age, 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 discon-
nected 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 enclo-
sure (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
To visually inspect the cables or to measure the temperature
of the cable terminations using a noncontact infrared
thermometer without opening the termination compartment
doors, lift the applicable termination compartment cover
panel. See Figure 33.
Figure 33. Lift the cover panel to visually inspect the
cables or to measure the temperature of the cable
terminations.