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Section 7 – Selector Switch Configuration
When supplied, a two position non load break selector switch is connected in series with the BreakMaster load
break switch. The two switches are key interlocked. To operate the selector switch, the BreakMaster switch must
be in the off position.
Since the selector switch is a non load break switch, speed of operation is not essential for safe operation.
However, to insure good contact when changing feeders, move the handle rapidly and forcefully when changing
feeder positions.
Section 8 – Duplex Switchgear Configuration
When supplied, the duplex configuration consists of tw
o BreakMaster Load Interrupter Switches connected
by a common load side bus. If fusing is included, it normally consists of only one set of fuses located in one
of the switch compartments between the load side bus and outgoing terminals. This arrangement allows the
selection of either of two incoming lines.
As standard, this arrangement is supplied with key interlocking for safe operation. Key interlocking normally con-
sists of a lock on each switch and a lock on each door. Each of the locks is keyed alike and only one key should
be available to operating personnel. Since the key is retained in its lock when a switch is closed or when a door is
opened, two things are assured:
a. Only one switch may be closed at a time to pr
ev
ent paralleling of incoming lines.
b. Both switches must be locked in the open position to unlock either main door, preventing access to
energized load side bus or fuses.
WARNING
Only one key should be available to operating personnel for this interlock scheme.
When shipped from the factory, each lock will have a separate key.
All extra keys must be destroyed or otherwise made inaccessible to
operating personnel. Failure to do so could result in severe injury or death.
!
BreakMaster Load Interrupter Switch
6.0.11 Lubrication
The load break interrupted switch requires infrequent lubrication. Bearing points and sliding surfaces should be
lubricated at the regular inspection periods (annually) with a thin film of low temperature lubricant. Before
lubrication, remove any hardened grease and dirt from latch and bearing surfaces with kerosene, varsol,
or naptha.
T
he contact surface of the movable blades and the stationary contact surface should be cleaned and greased
with SCH-32 Mobiltemp.
6.0.12 High Potential Tests
High potential tests to check the integrity of the insulation are not necessary if the insulation maintenance
instructions in this book are carefully followed. Should the purchaser desire to make high potential tests, the test
voltage should not exceed 14 kV A.C. for 4.16KV and 27 kV A.C. for 13.8 kV. These voltages are 75% of factory test
voltages and are in accordance with ANSI standards. Make sure any test performed conforms to all applicable
OSHA, ANSI and NEC standards.
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