IBM 7014-T42 User Guide - Page 30

Attention, source switches or fuses lock-out/tag-out to indicate that the power source is turned off

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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. 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 Figure 15. Routing the power cables 18 Power Systems: Racks and rack features

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4
Power distribution panel top 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.
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
Figure 14. Removing the cable channel cover
Figure 15. Routing the power cables
18
Power Systems: Racks and rack features