Safety Precautions
6 S&C Instruction Sheet 695-545
DANGER
S&C Vista SD Underground Distribution Switchgear operates at high voltage. Failure
to observe these precautions 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.
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 the
key interlocks to verify proper sequencing. After the
switchgear is installed, destroy all duplicate keys or make
them accessible only to authorized persons so 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 suit-
able 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 pres-
ent, proper precautions must be taken to ensure the
local earth ground cannot be severed or removed.
• 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 that are 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.
• The load-interrupter switch or fault interrupter may
be energized by backfeed.
• The load-interrupter switch or fault interrupter may
be energized in any position.
12. MAINTAINING PROPER CLEARANCE. Always
maintain proper clearance from energized components.
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