Front Barriers - S&C PMH Instructions For Operation Manual

S&C Source-Transfer PMH Pad-Mounted Gear
Outdoor Distribution (14.4 kv and 25 kv)
MINI-RUPTER SWITCHES — Continued
selector is in the "CHARGING POSITION," the control
circuit is disconnected to prevent manual or automatic
electrical operation (charging or tripping) in the event
that control power is restored; and the emergency-trip
port is mechanically blocked to prevent a manual
mechanical trip operation.
While holding the port open, insert the large notched
end (with recessed bolt) of the dual-purpose manual
handle and secure it to the end of the charging shaft by
turning the knurled knob clockwise 8 to 9 turns until firm
resistance is felt. To charge the mechanism, grasp the
tubular portion of the handle and, while pivoting the
handle a few degrees, push in to engage the charging
shaft. At the same time, rotate the handle as far as it will
go (approximately 120°) in the appropriate direction. The
"OPERATOR CHARGED" target will appear in the indica-
tor window.
After the charging operation, loosen the knurled knob
and remove the handle. The operation selector will spring-
return to the "OPERATING POSITION."

Front Barriers

Before proceeding with the instructions on handling the
front barriers, refer to the "DANGER" on pages 4 and 5,
and the "WARNING" on page 10.
Figure 8. Dual-purpose front barrier for switch in its nor-
mal, suspended position.
663-503 INSTRUCTION SHEET
Page 12 of 35
August 14, 1995
With Micro-AT
Ç
DANGER
When working in the high-voltage compartments,
always maintain proper clearance from energized
components. Failure to maintain proper clear-
ance will result in serious injury or death.
Always use an S&C Grappler (Catalog Number
4423) attached to a suitable universal pole (1 ¹ ⁄₄ inches
in diameter) to handle barriers and to install, remove,
open, or close fuses. The universal pole must be at
least 4 feet long (S&C Catalog Number 4451R2-E, or
equal) for 14.4-kv gear or at least 6 feet long (S&C Cat-
alog Number 4452R2-E, or equal) for 25-kv gear.
Place the dual-purpose front barrier in the "slide-in"
position whenever the Mini-Rupter Switch is open. When
the barrier is in the "slide-in" position, the switch blades
are isolated from the main contacts. This also keeps the
blades from closing if, for any reason, the Mini-Rupter
Switch is operated.
To insert the barrier in the "slide-in" position, use an
S&C Grappler™ attached to and in line with a suitable
universal pole. Figures 8 through 10 show the suggested
insertion method. The Grappler prongs are pointed
upward when lifting the front barrier.
Figure 9. Grappler being used to lift barrier. Note that door
holder is in place and adjacent door is bolted closed to
reduce exposure to high voltage.
S&C ELECTRIC COMPANY
®
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