IBM 9306 Hardware Maintenance Manual page 150

Figure 51. Connecting and routing other power cables to the outlets
Cabling instructions for horizontal-mount PDUs
If your Rack PDU came with more than one line cord, select either the high-voltage
cord or the low-voltage cord for your installation. Use the following procedure to
connect and route cables for Rack PDUs that you mounted in the horizontal EIA
space of your rack cabinet:
1. Connect the line cord that comes with this option to the inlet on a Rack PDU;
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Hardware Maintenance Manual: IBM PC Server/Enterprise Racks Types 9306, 9308
then, remove the screw on the cable clamp and route the line cord through the
clamp.