S&C Instruction Sheet 682-510 5
DANGER
Switchgear contains high voltage. Failure to observe the precautions below
will result in serious 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 .
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 and low-voltage
compartment or enclosure must be securely closed
with padlocks in place at all times unless work is
being performed inside .
6 .
ENERGIZED BUSHINGS. Always assume the
bushings are energized unless proven 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 that are to be inspected, replaced,
serviced, or repaired, always disconnect load-inter-
rupter 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
that are to be inspected, replaced, serviced, or
repaired .
10 .
GROUNDING.
• Make sure the switchgear tank and pad-mounted
enclosure are properly grounded to the station or
facility ground . Improper grounding will cause
equipment damage .
•
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
that are to be inspected, replaced, serviced, or
repaired .
11 .
LOAD-INTERRUPTER SWITCH AND FAULT-
INTERRUPTER POSITION.
•
Always confirm the
Closed/Open/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 a proper clearance from energized
bush ings .
Safety Precautions
