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(27) Insert the stripped ends of the red, black, and white wires into the through
holes of the bus bars. Ensure that all strands of each wire are in the hole and that
each wire is in the correct bus bar.
Note: Maintain the color code on the wires so that the wires that are inserted
match the colors of those wires that were factory installed.
(28) Securely clamp the wires in place by tightening the screws.
(29) Replace the front cover plate and secure with the eight screws removed
previously.
Downgrade from Four to Three Cabinets
When downgrading from four to three cabinets, see Figure 17-1 for the locations of
the input and distribution boxes, Fig.17-5 for the wiring for the bus bar, and proceed
as follows:
(1) Power down the -48 Vdc system by moving the circuit breaker located in the
input box to the OFF position.
(2) Remove the eight screws securing the front cover plate to the distribution box in
cabinet 2.
(3) Remove the cover plate.
(4) Loosen the two screws on the strain relief on the distribution box in cabinet 2
that secure power cable #2 (NT4G09BH A0331639). This cable connects the
box in cabinet 2 to the power converters in cabinet 3.
(5) Loosen, but do not remove, the screw in each of the three bus bars which
secures the red, black, and white wires of power cable #2.
(6) Loosen and remove the nut and washer holding the green wire to the stud in the
lower portion of the box.
(7) After removing the green wire from the stud, replace the washer and nut on the
stud.
(8) Remove the cable from the distribution box in cabinet 2.
(9) Remove the strain relief from the distribution box.
(10) Cover the hole in the distribution box with the snap-in hole cover supplied
with the kit.
(11) Detach the connector backshell from the power converter located in cabinet 3
by removing the two 1/2-inch screws holding the backshell to the rear panel of
the cabinet.
(12) Replace the front cover plate and secure with the eight screws removed
previously.
Installing a -48 Vdc Power Distribution System 155
Practice 450-1011-201
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