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35
01.4IB.46300
Installation
!
CAUTION
Defeating the isolating switch interlock allows
the user to close the isolating switch on to line
stabs. The equipment must be deenergized
and grounded prior to performing this act.
The user should also be fully aware of the
hazards involved with the results of defeating
this interlock, be familiar with the operation of
the isolating switch, and take all appropriate
safety precautions. The operating handle
must be returned to the off position to close
the high voltage compartment door. Moving
the operating handle from the on position
to the off position automatically resets the
interlock.
Figure 20 Isolation Switch Interlock
a. Isolation Switch-OFF Position
a
3) Contactor - Isolating Switch Mechanical
Interlock
The isolating switch functions only as a
disconnect and must never close on to
or interrupt a power load. To prevent
this, a mechanical interlock between the
vacuum contactor and the isolating switch
is provided. If the vacuum contactor is in
the
CLOSED
position, the interlock lever on
the vacuum contactor armature actuates
a mechanical linkage which locks the
operating handle operating mechanism of
the isolating switch.
4) Door Interference
The Eaton contactor and isolation switch
are equipped with interlocks intended
to prevent improper operation of the
contactor and isolating switch. The door to
the high voltage compartment is equipped
with two interlocks. These are to prevent
the isolation switch from moving to the
ON
position without the door being closed,
and to prevent the door from being opened
with the isolation switch in the
ON
position.
If the isolation switch mechanism interlock
has been defeated for inspection purposes,
the door to the high voltage compartment
will not fully close or latch. To fully close
and latch the high voltage compartment
door, the contactor must be tripped, and
the isolation switch handle moved to the
OFF
position. Only then can the high
voltage compartment door be fully closed
and latched shut. Do not attempt to close
the contactor and put into service if the
high voltage door is not fully closed and
properly latched.
DO NOT OPERATE THE CONTACTOR IF
THE DOOR INTERFERENCE PREVENTS
DOOR CLOSING.
