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Figure 2-15. Lifting and jacking methods for low voltage section.
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TM-5-6120-250-34 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Avionics Model 950-2200A Manual
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Figure 2-16. Circuit breaker installation
(4)  Reset racking handle to its lowered position
(6)
Bus connections, 3 phases, neutral and
and lift it again. This operation must be performed five
ground.
times to completely disengage the cams from their
CAUTION
racking pins.
When making bolted bus connections clean
(5)  After the fifth lifting stroke let handle drop to
the silver plated contacting surfaces with a
its normal position.
clean  cloth  or  solvent  if  required.
(6) Pull the breaker out of its compartment until it
Sandpaper or abrasives must not be used.
engages the test stop.
Apply  contact  lubricant.  Bolt  the  bus
(7) Depress the test position stop handle (located
connection  using  a  bolt,  washer  and
directly beneath and in middle of breaker), and pull the
lockwasher. Refer to table 1-1 for the proper
breaker out as far as the drawout tray will travel.
torque values of bus bolts and nuts.
b. Lifting Circuit Breaker from Drawout Tray.
(1)  Use a portable crane (hoist) and a web sling
(7)  Insert the two wires in the conduit (from high
approximately I inch wide and 6 feet long with a loop on
voltage section) through the conduit connection on lower
each end. Both sling and crane must be capable of lifting
right end wall of transition.
and supporting 400-500 lbs.
(8)  Connect conduit to transition wall and secure
(2)  Place sling under and across the two top
it to transformer (fig. 2-12).
frames of the breaker (fig. 2-16).
(9)  Connect the two wires from the conduit to
(3)  Loosen and remove the two 3/8 inch hex
the terminal board HX mounted on the lower left inside
head bolts in front, of the base angles of the breaker
wall, connect to terminals I and 2.
fastening breaker to drawout tray.
(I0) Replace transition rear access cover and
(4)  Lift the breaker approximately I / 2 inch off
secure with its 24 bolts and washers.
the dowel pins in rear bottom of the drawout tray.
(11) Open both rear doors and check for
(5)  Pull the breaker forward until its primary
alignment and that weatherproof seal has not been
contacts clear the cabinet.
disturbed.
(6)  Push the tray all the way back into the
(12) Check that all bus connections are tight,
compartment.
fuses in place.
(7)  Close the breaker compartment panel.
(13) Check both front doors as in paragraph (11)
(8)  The breaker can now be moved to wherever
above.
the situation dictates.
(14) Check circuit breaker panels alignment and
working.
2-22.
Circuit Breaker Installation
(15) Check
circuit
breaker
drawout
mechanism for alignment and workability.
a. Clear Trailer deck of all unnecessary objects and
(16) Close and secure all panels and doors.
equipment from area where breaker is to be installed.
WARNING
b. See paragraph 2-21 b for lifting circuit breaker.
Whenever  circuit  breakers  are  being
c.  Inserting circuit breaker.
installed,
removed,
inspected,
or
(1)  Make sure that breaker contacts are open.
maintenance is being done, the breaker
(2)  Raise or lower breaker to a position
must be open and the closing springs
approximately six inches above its compartment drawout
restrained by the safety pin.  Otherwise
tray. (fig. 2-1 6).
serious bodily injury and / or damage to the
(3)  Pull drawout tray out under the breaker until
equipment may result.  See paragraph 5-3
the outer limit stop is reached.
for safety pin insertion.
WARNING
2-21. Removal of Circuit Breaker
Make sure a bolt is in each of the front
a. Breaker Withdrawal.
bottom mounting holes of the housing, the
(I)  Push trip button, breaker should trip free and
bolt heads provide the limit stop for drawout
indicator read "OPEN".
This also releases positive
tray. If these are not in place, serious bodily
racking interlock.
injury or damage to equipment may result.
CAUTION
Never open breaker compartment panel
(4)  Lower the breaker to a distance of about I / 2
unless the breaker is open.
inch above dowel pins on the tray. Push the breaker back
(2)  Open breaker compartment hinged panel.
into its compartment so that the rear bottom angle of the
(3)  Lift the racking handle as far as it will go.
breaker is against the guides. The guides are on the tray
This re-engages the trip interlock to hold the breaker trip-
directly back of the dowel pins.
free for the remainder of the withdrawal racking operation.
2-16

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