Safety Precautions
S&C Instruction Sheet 681-510 5
DANGER
Vista Underground Distribution Switchgear operates at high voltage.
Failure to observe the precautions below will result in serious personal injury
or death.
Some of these precautions may differ from company operating procedures and
rules. Where a discrepancy exists, users should follow their company’s operating
procedures and rules.
1.
QUALIFIED PERSONS. Access to switchgear must
be restricted only to qualified persons. See the
“Qualified Persons” section on page 2.
2.
SAFETY PROCEDURES. Always follow safe
operat ing procedures and rules. Always maintain
proper clearance from energized components.
3.
PERSONAL PROTECTIVE EQUIPMENT. Always
use suitable protective equipment, such as rubber
gloves, rubber mats, hard hats, safety glasses, and
flash clothing, in accordance with safe operating
procedures and rules.
4.
SAFETY LABELS. Do not remove or obscure any of
the “CAUTION,” “WARNING,” or “DANGER” labels.
5.
CLOSING AND LOCKING ENCLOSURES. The
pad-mounted enclosure (if furnished) must be
securely closed with padlocks in place at all times
unless work is being performed inside the enclosure.
6.
ENERGIZED BUSHINGS. 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.
7.
BACKFEED. Bushings, cables, load-interrupter
switches, and fault interrupters may be energized by
backfeed.
8.
DE-ENERGIZING, TESTING, AND GROUNDING.
Before touching any bushings or components inside
the switchgear tank that are to be inspected, replaced,
serviced, or repaired, always disconnect load-
interrupter switches and fault interrupters from all
power sources (including backfeed), test for voltage,
and properly ground.
9.
TESTING. Test the bushings for voltage using the
Voltage Indication feature (if furnished) or other
proper high-voltage test equipment before touching
any bushings or components inside the switchgear
tank that are to be inspected, replaced, serviced, or
repaired.
10.
GROUNDING. Make sure that the switchgear tank
and pad-mounted enclosure (if furnished) are
properly grounded to the station or facility ground.
After the switchgear has been completely discon-
nected from all sources of power and tested for
voltage, properly ground the load-interrupter
switches and fault interrupters before touching any
bushings or components inside the switchgear tank
that are to be inspected, replaced, serviced, or
repaired.
11.
LOAD-INTERRUPTER SWITCH AND FAULT-
INTERRUPTER POSITION. Always confirm the
Open/Close/Grounded position of load-interrupter
switches and fault interrupters by visually observing
the position of the blades. Load-interrupter switches
and fault interrupters may be energized by backfeed.
Load-interrupter switches and fault interrupters may
be energized in any position.
12.
MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized bush ings.
