8 S&C Instruction Sheet 695-505
Safety Precautions
DANGER
Vista SD 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 your company’s operating procedures and
rules. Where a discrepancy exists, follow your company’s operating procedures and
rules.
1.
QUALIFIED PERSONS. Access to the Vista SD
underground distribution switchgear must be restricted
only to qualified persons. See the “Qualified Persons”
section on page 2.
2.
SAFETY PROCEDURES. Always follow safe
operating 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
arc-flash clothing in accordance with safe operating
procedures and rules.
4.
DOORS. High-voltage compartment doors must be
securely closed and latched, with padlocks in place at
all times unless work is being performed inside the
enclosure.
5.
KEY INTERLOCKS. Optional key interlocks, if
furnished, must be in place. Check the operating
sequence of key interlocks to verify proper sequencing.
After the switchgear is installed, destroy all duplicate
keys or make them accessible only to authorized
persons so that the key-interlock scheme will not be
compromised.
6.
OPENING DOORS. Do not apply any undue force
when attempting to open a door. The use of undue
force may damage the door-latching mechanism.
7.
SAFETY LABELS. Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or “NOTICE”
labels.
8.
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.
9.
BACKFEED. Bushings, cables, load-interrupter
switches, and fault interrupters may be energized by
backfeed.
10.
GROUNDING.
• Vista SD Switchgear must be connected to a
suitable earth ground before energizing, and at all
times when energized.
• The ground wire(s) must be bonded to the system
neutral, if present. If the system neutral is not
present, proper precautions must be taken to
ensure that the local earth ground cannot be
severed or removed.
• After the switchgear has been completely
disconnected from all sources of power and tested
for voltage, properly ground the load-interrupter
switches and fault interrupters before touching any
bushings or components to be inspected, replaced,
serviced, or repaired.
11.
LOAD-INTERRUPTER SWITCH OR FAULT
INTERRUPTER POSITION.
• Always confirm the open/closed position of the
load-interrupter switch or fault interrupter by visually
observing the position of the isolating disconnect.
• Load-interrupter switch or fault interrupter may be
energized by backfeed.
• Load-interrupter switch or fault interrupter may be
energized in any position.
12.
MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized
components.
