1.8. 33-790-11
5.
Close Bar Guard
This covers the close bar to prevent unintentional manual
closing
of
the breaker. It is mounted on the front panel to
cover the close
bar.
In
case
of
emergency, the breaker
may be closed by pushing the close bar through a small
hole
in
the cover. See Figure 26c.
6.
Operation Counter
Mechanical counter mounted under the top plate below
the auxiliary switch provides the record
of
the number
of
breaker operations. The counter
is
connected through
linkage to the pole shaft.
5.1.7 Mechanical Interlocking, Description and
Explanation
of
Operation
To increase safety to personnel and the circuits to which
the breaker is connected, the complete unit
is
equipped
with automatic mechanical interlocking. This interlocking
is
effective
in
various ways
in
the four breaker positions
(Figure 27):
Page 29
A WARNING
DO NOT TAMPER WITH INTERLOCKING, AND IF IS
NOT FUNCTIONING, HAVE IT CORRECTED. INTER-
LOCKING THAT IS FUNCTIONING IMPROPERLY CAN
RESULT
IN
MECHANICAL AND ELECTRICAL DAM-
AGE TO EQUIPMENT AND BODILY INJURY TO PER-
SONNEL.
a.
The REMOVE position.
b.
The DISCONNECT position.
c.
The TEST position.
d.
The CONNECT position.
In
addition there is
an
interference interlock described
in
Section 5.1.6.1.
This mechanical interlock system serves basic purposes
as follows:
1.
In
the REMOVE position it prevents the breaker from
being closed and prevents the closing springs from
being charged or remaining charged. The levering
device shutter is held open.
1. Indicator Index Tab
2.
Front
Panel
5. Indicator Pivot Pin
8.
Trawling
Stop
Nut
8.
Indicator Levar
9.
Levering Worm Gaar
3.
Lewring Worm
Shaft
4.
Levering Worm
Fig.
27 Drawout Unit Position Indicator
Effective October 1998
7.
Traveling
Stop
Nut
Clamp
10. Lewring Shaft
Courtesy of NationalSwitchgear.com
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