S&C ELECTRIC COMPANY
•
Chicago
S&C ELECTRIC CANADA LTD.
•
Toronto
s
783-501
INSTRUCTION SHEET
Page 4 of 4
August 29, 1983
S&C Alduti-Rupter
®
Switches
Three-Pole
Indoor Transmission (4.8 kv through 34.5 kv)
MAINTENANCE
a
Printed in U.S.A.
So that the Alduti-Rupter Switch is ready for normal opera-
tion, be sure that the following conditions exist:
•
Voltage transformers are reconnected and their fuses
are in place.
•
Temporary grounds are removed.
•
High-voltage fuses (SM-4Z, SM-5S, or SM-5SS), if appli-
cable, are closed and latched (disconnect style) or
secured in their clips (non-disconnect style).
•
Screen doors, if furnished, are closed and bolted.
•
Switchgear bay (or vault) access door is closed and
padlocked (or interlocked).
•
The Alduti-Rupter Switch is in the correct position—
open or closed—as required by the system operating
arrangement.
•
The Alduti-Rupter Switch operating handle is pad-
locked.
TO RESTORE TO NORMAL OPERATION
No routine maintenance is required for S&C Alduti-Rupter
Switches—Indoor Distribution, or S&C Alduti-Rupter
Switches with Power Fuses—Indoor Distribution. How-
ever, cleaning and inspection of switch (and fuse) support
insulators and barriers should be performed periodically,
at intervals based on environmental conditions. Also, occa-
sional exercising of S&C Alduti-Rupter Switches is recom-
mended.
When access to high-voltage bays (or vaults) is required
for such purposes, it should be restricted to qualified per-
sons only, who should observe the following procedure:
1. At all times adhere to the prescribed safety rules which
are applicable to such devices as circuit breakers, fuses,
interrupter switches, power switching equipment, and
their mechanisms.
2. Make certain that any such device is disconnected from
all power sources and all control sources; and grounded
before being inspected, serviced, or repaired.
3. Always assume both sets of power terminals on any
device to be energized unless proved otherwise by test,
by visual evidence of open circuit conditions on both
terminal ends, or by grounding.
CAUTION: The voltage
transformers must be disconnected
when external volt-
age is used to test any secondary-side wiring and
devices, to avoid energizing the high-voltage conductors
through the voltage transformers. Draw out the voltage
transformers completely if drawout type transformers
are provided. Otherwise, remove the primary fuses of
the voltage transformers and disconnect the secondar-
ies by removing the secondary fuses or by disconnect-
ing the secondary connections to the transformers. If
secondary connections are disconnected, tape the ends
of the leads to prevent inadvertent short circuits or con-
tact with the transformer secondary terminals.
As a safety precaution it is recommended in any event
that all voltage-transformer fuses be completely removed
and kept out until just prior to final energizing of the
switchgear. With unfused transformers, remove the sec-
ondary connections (as described in the preceding para-
graph) until tests are completed.
4. Test for voltage. Qualified persons should be certain
that they have, and know how to operate, the correct
test equipment for determining the voltage on both sets
of power terminals in any circuit breaker, power fuse,
or interrupter-switch equipment.
5. After the electrical switchgear has been completely dis-
connected from all sources of power, properly connect
grounding leads to both sides of the equipment, that is,
to the source- and load-side power terminals or con-
tacts of each phase of the equipment to be maintained.
NOTE: Occasionally low-voltage components may require
maintenance. In the servicing or repair of space heaters,
voltage-transformer secondary wiring, and any other com-
ponents located in a high-voltage bay, all of the preceding
safety procedures apply. The maintenance of other low-
voltage components (control devices, meters, etc.), iso-
lated from high-voltage bays, may be performed under the
safety rules for equipment rated 600 volts or less.
a
These recommendations may differ from the user’s operating and safety procedures. Where a discrepancy exists, users should follow their procedures.
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