Installation Manual
Site v erication Chapter 2: UBS Macro B T S Installation Procedure
Table 2 -8 +27 V DC and –48 V DC Fr ame P ower Cabling and P ower Supply Break er
Information (Continued)
Qty of XMIs
Maximum
cable length
Cable
size
(A WG)
Cable insulation
temperature rating
(° C)
Qty of power
feeds (+ and
- pairs)
Breaker size per
feed (Amps DC)
4 661.11 cm
(21.69 ft)
2/0 200 2 250
4 833.63 cm
(27.35 ft)
3/0 150 2 250
4 1051.25 cm
(34.499 ft)
4/0 150 2 250
Frame positioning
Typically , equipment frames are positioned side -by -side, with the frame fronts facing the same
direction.
Rack base description and dimensions
The base of the rack consists of the following:
• Isolation pads attached to the base to isolate the rack from the floor . The isolation pads are
positioned between the floor and the base.
• Six 22 mm (0.87 inches) M12 mounting holes.
• Plastic shoulder washer in each hole to isolate the frame from the floor . Figure 2 -5 shows
the footprint of the rack.
2 -18 68P09283A62 -3
PRELIMINARY A UG 2007