IBM 7014-T42 User Manual page 30

4 Power distribution panel top cover
Figure 14. Removing the cable channel cover
4. Remove the -48 V dc bus bar shield from the power distribution panel.
Attention: The bus bar shield must be correctly reinstalled over the -48 V dc return bus bars to
protect against injury while servicing the power distribution panel.
5. Ensure that the following steps are performed when connecting the dc power source.
a. At -48 V dc power source, turn off any -48 V dc power sources that will be connected to the
power distribution panel.
b. After the -48 V dc power sources are turned off, be sure there is a tag or label over the power
source switches or fuses (lock-out/tag-out) to indicate that the power source is turned off
intentionally.
Note: Ensure that any oxidation on the copper bus bars is removed.
c. If this is a raised-floor installation and you are working at the back of the rack, route the power
cables up the rack's right side.
d. Ensure that the external -48 V dc power cable is connected correctly to the -48 V dc bus bar.
e. Ensure that the external -48 V dc return cable is routed correctly and installed on the return bus
bar.
Figure 15. Routing the power cables
18
Power Systems: Racks and rack features
1 -48 V dc power cable and return power cable
2 Power distribution panel
3 Front of rack
4 -48 V dc power cable and return power cable