IBM 9306 Hardware Maintenance Manual page 36

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Hardware Maintenance Manual: IBM PC Server/Enterprise Racks Types 9306, 9308
v Plug power cords from devices in the rack cabinet into electrical outlets
that are located near the rack cabinet and are easily accessible.
v Each rack cabinet might have more than one power cord. Be sure to
disconnect all power cords in the rack cabinet before servicing any
device in the rack cabinet.
v Install an emergency-power-off switch if more than one power device
(power distribution unit or uninterruptible power supply) is installed in
the same rack cabinet.
v Connect all devices installed in a rack cabinet to power devices installed
in the same rack cabinet. Do not plug a power cord from a device
installed in one rack cabinet into a power device installed in a different
rack cabinet.