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162 Installing a -48 Vdc Power Distribution System
Installing Upgrade Kit NT4G13AX (From Five to Six Cabinets)
This procedure describes how to expand a -48 Vdc system from five to six
cabinets. The kit consists of one cable (NT4G09BH A0331639) and a label.
This procedure consists of adding one cable to the distribution box in cabinet 5, and
connecting the new cable to the power converter in cabinet 6. See Fig. 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
(2) Remove the eight screws securing the front cover plate to the distribution box in
(3) Attach the new power cable #2 to the power converter in cabinet 6.
(4) Lightly secure the connector backshell to the cabinet backpanel with two
(5) Engage the power converter to ensure proper alignment.
(6) Tighten the screws holding the backshell.
(7) Remove the snap-in hole cover from the bottom of the distribution box located
(8) In the empty hole in the distribution box, install the strain relief supplied with
(9) Insert the cable end through the empty strain relief in the distribution box
(10) Securely tighten the clamping screws on the strain relief.
(11) Remove a nut and washer from one of the empty studs in the lower portion of
(12) Place the ring terminal from the green wire over the stud in the lower part of
(13) Place the flat washer over the ring terminal, and secure with the nut removed
Practice 450-1011-201
input box to the OFF position.
cabinet 5.
1/2-inch screws.
in cabinet 5.
the new power cable #2.
Note: It may be necessary to remove the small access cover from the bottom of
the distribution box in order to tighten the locknut on the inside of the box.
located in cabinet 5. Ensure that approximately 1/4-inch of cable jacket
protrudes through the strain relief and into the box.
the box.
the distribution box.
previously.
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