Exceeding the nameplate ratings of an LBS switch
may cause property damage, severe injury, or
death.
Page 3
Do not apply an LBS switch beyond its nameplate
ratings.
1.3 Safety Features
The Type LBS load interrupter switch is manufactured
with several built-in interlock provisions and safety
features to reduce hazards and provide proper
operating sequences:
1.
A mechanical interlock prevents opening the
main door when the switch is in the closed
position.
2.
An additional interlock prevents inadvertent
closing of the switch when the front enclosure
door is open.
3.
The switch design includes provisions for
padlocking the switch in the open or closed
position.
4.
Mechanical indicators with labels show
whether the switch is open or closed.
5.
Optional key interlock provisions may be
provided for Main-Tie-Main and other
configurations. Refer to the specific order
drawings to determine if key interlocks have
been provided.
6.
A grounded metal safety screen is located
behind the medium voltage door. The screen
prevents inadvertent contact with live parts yet
allows full-view inspection of the switch blade
position.
Danger!
Type LBS switches are often energized by a back-fed
condition that allows the blades to be energized with the
switch in the open position. The line-side break jaws
are also likely to be energized with the switch open.
All power sources must be isolated and locked out
before removing the safety screen.
1.4 Safe Practices
Only qualified electrical workers with training and
experience on medium voltage circuits should be
permitted to work on this equipment. They should be
familiar with the work to be performed, the safety
equipment required, and hazards involved.
Read and understand these instructions before
attempting any assembly, operation, or maintenance of
an LBS switch.
Disconnect all power sources before making any
adjustments or performing maintenance.
WARNING!
Defeating or disengaging safety interlocks on an
LBS switch that is properly installed and connected
to a power source may result in property damage,
bodily injury or death.
Do not defeat or disengage any safety interlocks when
the switch is connected to any power source.
Never energize an LBS switch without the arc chutes
and phase barriers installed.
Always be sure that all hardware is in place and
properly tightened before putting an LBS switch into
operation after any maintenance operation. The contact
and blade hardware must be tightened as described in
Section 5 to provide the correct contact pressure while
maintaining free operation of the blades.
SECTION 2 – RECEIVING, HANDLING AND
STORAGE
2.1 Receiving
When receiving an LBS switch, a visual inspection
should be performed immediately upon receipt of the
switch and before removing it from the truck. Shipping
papers should be checked to be sure that all boxes or
other accompanying pieces have been received. If any
damage or shortages are evident, a claim should be
filed at once with the carrier and the nearest Cutler-
Hammer sales office should be notified.
2.2 Handling
An LBS switch is insulated for high voltages and must
be protected at all times against damage during
handling.
2.3 Storage
If it is necessary to store an LBS switch before
installation, keep it in a clean, dry location with ample air
circulation and heat to prevent condensation. Like all
electrical apparatus, an LBS switch contains insulation
that must be protected against dirt and moisture.
