S&C ELECTRIC COMPANY
s
INSTRUCTION SHEET
663-503
Page 5 of 35
August 14, 1995
Ç
DANGER
— Continued
16.
S&C GRAPPLER.
v
The Grappler (Catalog Number 4423) is the S&C
fuse-handling fitting supplied with each unit equipped
for fuses.
v
The Grappler improves grip, balance, and control
of fuses during handling.
v
Always use the S&C Grappler attached to a suit-
able universal pole (1
¹⁄₄
diameter) to handle barriers
and to install, remove, open, or close fuses. The uni-
versal 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 Catalog Number 4452R2-E, or
equal) for 25-kv gear.
17.
MAINTAINING PROPER CLEARANCE.
v
When working in the high-voltage compartments,
always maintain proper clearance from energized
components.
v
When handling barriers or when installing, remov-
ing, opening, or closing fuses, always use an S&C
Grappler attached to a suitable universal pole (see 16
above).
18.
FRONT BARRIERS.
v
Always use an S&C Grappler attached to a suitable
universal pole to handle barriers in the high-voltage
compartments.
v
Do not leave dual-purpose front barriers in the
“slide-in” position for more than one week. If the bar-
riers are left in the “slide-in” position for an extended
period of time, there is the possibility of corona dis-
charge to the barriers. Prolonged exposure to corona
discharge can damage the barriers and result in a
flashover, injury, and equipment damage.
v
Switch Side:
These barriers are intended for tem-
porary use to isolate the blades of the Mini-Rupter
Switch from the main contacts while work is being
performed.
v
Fuse Side:
These barriers are intended for tempo-
rary use to isolate the fuse from the contacts of Uni-
Rupter while work is being performed.
19.
CLOSING FUSES.
Closing a fuse into a faulted cir-
cuit will cause a loud noise, a flash of light at the Uni-
Rupter contacts, and the fuse to blow. Closing a fuse
into a faulted circuit is always a possibility. When
closing a fuse, always turn your face away then use a
swift, unhesitating thrust since the closing operation
is completely operator dependent. With Uni-Rupter,
a fuse can be closed into a fault current once or
twice as specified in Appendix C, and the Uni-Rupter
will remain operable and able to carry and interrupt
rated current.
SAFETY PRECAUTIONS — Continued
OPERATING DESCRIPTION
Refer to S&C Instruction Sheet 515-500 for an operating
description of the Micro-AT Source-Transfer Control.
Remote Indication
The optional remote-indication feature (Catalog Number
Suffix “-Y4”) includes isolated contacts wired to a termi-
nal block for user’s external connection to remote indicat-
ing devices. Isolated contacts are provided for remotely
monitoring the presence of source voltages; the position
of the manual/automatic operation selector switch; and
the status of the “ready” indicating lamp, “event” indicat-
ing lamp, and overcurrent-lockout circuit (if furnished).
Remote indicating devices and their control power are to
be provided by the user and installed in accordance with
the manufacturer’s instructions.
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.
