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S&C Instruction Sheet 663-590
Safety Precautions
DANGER
S&C Source-Transfer PMH Pad-Mounted Gear operate 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 S&C
Source-Transfer PMH Pad-Mounted
Gear must be restricted only to qualified
persons . See “Qualified Persons” on page 2 .
2. Safety Procedures. Always follow safe operating
procedures and rules . Always maintain proper clear-
ance from energized components .
3 . Doors. High-voltage compartment doors must be
securely closed and latched, with padlocks in place
at all time unless work is being performed inside the
enclosure . Mini-Rupter Switches have switch-oper-
ating-shaft access covers located on the sides of the
pad-mounted gear enclosure . They must be closed
and padlocked at all times unless the switches are
being operated .
4 . Key Interlocks. Optional key interlocks, if furnished,
must be in place . Check the operating sequence of key
interlocks to verify proper sequencing . After the pad-
mounted gear is installed, destroy all duplicate keys or
make them accessible only to authorized persons so
that the key-interlock scheme will not be comprised .
Key interlocks are not security locks and are not substi-
tutes for padlocks .
5. 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 . If optional key
interlocks are provided, make certain that the interlocks
are in their correct positions to allow door opening .
6. Safety Labels. Do not remove or obscure any of
the “DANGER,” “WARNING,” “CAUTION,” or
“NOTICE”
labels .
7. Personal Protective Equipment. Always use suitable
protective equipment such as rubber gloves, rubber
mats, hard hats, safety glasses, and arc-flash cloth-
ing in accordance with safe operating procedures and
rules, especially when handling fuses and barriers
within high-voltage compartments .
8.
Grounding. The S&C Source-Transfer PMH Pad-
Mounted Gear enclosure must be connected to a
suitable earth ground before energizing, and at all
times when energized .
9. Fuses. Make certain that fuses are disconnected from
all power sources (including backfeed) before being
inspected or replaced .
10. Mini-Rupter Switches. Always confirm the open/close
position of Mini-Rupter Switches by visually observing
the position of the switch blades .
11. Energized Components. Always assume that both
terminals of any switch or fuse are energized unless
proved otherwise by test, by visual evidence of open-
circuit conditions on both terminals, or by observing
that both terminals are grounded .
