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CHAPTER 4-INSTAllATlON
CHAPTER 4
INSTALLATION
Section l-Installation Instructions
4-1-1 GENERAL
4-1-1-1
For information in regard to unpacking
and handling see preliminary data on page
iii.
Refer to figures 7-1-1 and 7-1-2 for outline and
mounting dimensions.
4-1-1-2
To install the stationary component:
(a)
If
the movable component is in the sta-
tionary component, remove it following instruc-
tions in paragraph 4-1-1-4.
CAUTION
If
circuit breaker is to he removed from
a stationary component that is not mounted
in a switchboard, care must be taken so
the assembly does not tilt forward when
removing the breaker.
(b)
Insert stationary component into switch-
board compartment making certain that it moves
all the way in so that it is tight against the
structural members at the rear of the com-
partment.
(c) Secure the stationary component to the
switchboard structure by means of:
(1) six
1/2-13 hex-head bolts inserted from the rear
of the switchboard through holes in the vertical
members at the rear ofthe compartment and into
the tapped holes in the rear of the stationary
component, and (2) four 3/4-10 hex-head bolts in-
serted through four holes in the lower front edge
of the stationary component and into the tapped
hole in the switchboard structural member.
NOTE
If
the stationary component is to be
mounted in the bottom compartment of
the switchboard, the bolts used for se-
curing the switchboard to its foundation
must first
go
through the lower front
edge of the stationary component, then
through the base member of the switch-
board and into the switchboard foundation
structure or channels.
(d)
Make the necessary control wiring connec-
tions to the stationary secondary disconnect
fingers.
.
(e) Connect the switchboard bus work to the
primary breaker studs follOwing Navy accepted
practices.
4-1-1-3 To install the movable component into
the stationary component.
(a)
Turn the knurled screw that secures the
rail extension assembly in a vertical position
counterclockwise until the threads are fully dis-
engaged, and lower the rail extensions.
(b)
Remove the screw at the far end
of
each
of the two flat bars of the extension lever han-
dle that slide into the rail extensions. Remove
the extension lever handle by pulling straight
out.
(c)
Lift the movable component by means of
suitable hooks placed in the lifting holes, and
place it on the rail extensions making sure that
the front roll out wheels are directly behind the
stop on the front end of the top edge of the rail
extensions.
The two flanges on the roll out
wheels should straddle the rail extensions.
(d)
Depress the cell interlock lever on the
front lower right hand portion of the movable
component and push the movable component into
the stationary component until the cam roner
hits the cam On the far end of the rail exten-
sions.
(e)
Replace the extension lever handle follow-
ing instructions in paragraph
(b),
above, in re-
verse order.
(f)
For this step it is not necessary to de-
press
the
cell interlock lever. Push up on the
extension lever handle until the rail extensions
are almost in a vertical position, then slide the
extension lever handle into the rail extensions
all the way, and continue then to push on the
extension lever until the rail extensions are
vertical.
During the above procedure the cam rollers
on the movable component engage in the cam
on the rail extensions to move the movable com-
ponent into the connected position.
When the
connected position is reached the cell interlock
4·1
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