S&C Source-Transfer PMH Pad-Mounted Gear
With Micro-AT
®
Control
Outdoor Distribution (14.4 kv and 25 kv)
S&C ELECTRIC COMPANY
s
663-503
INSTRUCTION SHEET
Page 4 of 35
August 14, 1995
Ç
DANGER
1.
QUALIFIED PERSONS.
Access to pad-mounted gear
must be restricted only to qualified persons. See “Qual-
ified Persons” 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.
KEY INTERLOCKS.
v
If optional key interlocks were furnished, they must
be in place.
v
Check the operating sequence of key interlocks to
verify proper sequencing.
v
After the pad-mounted gear is installed, either: (1)
destroy the extra set of keys or (2) make them accessi-
ble only to qualified persons. This will maintain the
integrity of the key-interlock scheme.
v
Key interlocks are not security locks and are not
substitutes for padlocks.
6.
MECHANICAL CABLE INTERLOCKS.
If optional
mechanical cable interlocks were furnished, periodi-
cally verify that these interlocks are functional. These
interlocks prevent operation of the Mini-Rupter Switch
when the associated switch-compartment door is open.
7.
OPENING DOORS.
Do not force doors open. Forcing
a door open can damage the latching mechanism. If
optional key interlocks are furnished, correctly posi-
tion the interlocks so the doors can be opened.
8.
CLOSING AND LOCKING DOORS.
v
Doors must be securely closed and latched, with
padlocks in place at all times unless work is being
performed inside the enclosure.
v
Do not close a door on a fuse in the open position.
The door will strike the fuse pull ring which will
interfere with door closing. The door may be closed if
the fuse is removed from the mounting.
9.
ENERGIZED TERMINALS.
Always assume that
both sets of power terminals on any Mini-Rupter
Switch or fuse are energized unless proved other-
wise by test, by visual evidence of open-circuit con-
ditions on both sets of terminals, or by observing that
both sets of terminals are grounded.
10.
BACKFEED.
Mini-Rupter Switches, switch termi-
nals, fuses, and fuse mountings (Uni-Rupter, load-side
hinge, and terminals) may be energized by backfeed.
11.
DE-ENERGIZING.
Before touching any device that
is to be inspected, replaced, serviced, or repaired in
the high-voltage compartments, always disconnect
Mini-Rupter Switches, fuses, and other devices such
as voltage sensors from all power sources (including
backfeed) and control sources, test for voltage, and
properly ground.
12.
TESTING.
Test for voltage on both sets of power ter-
minals of any Mini-Rupter Switch or fuse using
proper high-voltage test equipment before touching
any device that is to be inspected, replaced, serviced,
or repaired in the high-voltage compartments.
13.
GROUNDING.
v
Make sure that the pad-mounted gear enclosure is
properly grounded to the station or facility ground.
v
After the gear has been completely disconnected
from all sources of power and tested for voltage,
install suitable grounding cables in all compartments
before touching any device that is to be inspected,
replaced, serviced, or repaired in the high-voltage
compartments.
14.
SWITCH POSITION.
v
Always confirm the open/close position of the
Mini-Rupter Switches by visually observing the posi-
tion of the switch blades.
v
Switches and switch terminals may be energized
by backfeed.
v
Switches and switch terminals may be energized in
any position.
15.
FUSE POSITION.
Fuses and fuse mountings (Uni-
Rupter, load-side hinge, and terminals) may be
energized by backfeed even when the fuse is in the
fully open position.
SAFETY PRECAUTIONS
Pad-mounted gear 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.
CONTINUED
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