i.
A final thorough inspection should be made to
ensure that no tools or other objects have
been accidentally left inside the enclosure.
SECTION 4 - OPERATION
Page 5
4.1 MECHANICAL SAFETY INTERLOCKS
WARNING!
Defeating or disengaging safety interlocks on an
LBS switch that is connected to a power source
may result in property damage, bodily injury or
death.
Do not defeat or disengage any safety interlocks unless
all power sources have been disconnected and locked
out.
The LBS switch is equipped with switch interlocks and
door interlocks as described in section 1.2.
Fig. 5
Door/Switch Interlocks
4.1.1 Door/Switch Mechanism Interlock
This mechanical interlock prevents inadvertent closure
of the switch if the enclosure door is open. When the
door is closed, a bracket fastened to the inside of the
enclosure door causes the interlock latch to move out of
the blocking position (see Fig. 5).
4.1.2 Door/Switch Shaft Interlock
This interlock prevents the door of the enclosure from
being opened when the switch is closed. If the switch is
closed, a hook welded to the operating shaft engages a
bracket fastened to the inside of the switch enclosure
door, thus preventing the door from being opened. (See
Fig. 5.)
4.1.3 Key Interlocking, LBS Switch
Key interlocks for one or two key, Kirk brand type “F”
locks (or other manufacturers’ equal) with one-inch bolt
projection are optionally available on the LBS switch.
Refer to the specific order drawings for a description of
operation for these interlock schemes, when provided.
4.2. Switch Operation
CAUTION!
Attempting to operate an LBS Switch with a key
interlock bolt extended will result in equipment
damage and may also expose a person to bodily
injury or death.
The key must be inserted into the interlock and rotated
to retract the locking bolt before operating an LBS
switch.
To close or open an LBS switch, the operating handle is
inserted into the handle casting and rotated up or down
as appropriate. This charges the compression spring,
and as the spring lever goes over-toggle, the stored
energy of the spring is transferred to the shaft which
snaps the switch open or closed. The blades thus
move at a predetermined speed that is independent of
the operator.
When the LBS in mounted in the bottom compartment
of an Ampgard structure, care should be taken to insure
that the operator’s hand is not located between the
handle end and the floor. Grasp the operating handle as
shown in Figure 6 to insure safe, reliable operation of
the switch. The operator should stand clear of the
handle while opening or closing the switch. Care
should be exercised to avoid dropping the handle.
Store the handle in the clips provided on the handle
coverplate (see Fig 6).
Mechanism
Intlk
CAUTION!
Make certain that the switch door is fully
closed and the ¼-turn latches fully engaged
before operating the switch.
Operating the switch without the main door and ¼-
turn latches fully closed could result in damage to
the door or door interlock.
Shaft
Intlk
