IBM DPI C13 PDU+ Installation And Maintenance Manual page 22

2. Hold the PDU in the side of the rack cabinet, and attach the vertical-mounting
3. If the PDU comes with a detached power cord, connect the power cord now.
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DPI C13 PDU+, DPI C19 PDU+, and DPI C19 3-phase PDU+: Installation and Maintenance Guide
brackets to the side braces with four M6 screws and nuts that come with the
PDU.
Notes:
a. Leave enough space to connect, route, and disconnect power cables.
b. If you are installing a cable-management bracket in the same side of the
rack cabinet, leave enough space between the outlet-side of the PDU and
the EIA mounting flanges for the cable-management bracket installation.
Attention: You must disconnect the main input power before connecting or
disconnecting the input power cord from the PDU.
Align the connector on the power cord that comes with the PDU with the
connector on the front of the PDU, turning as necessary for key alignment; then,
turn the twist-lock on the connector clockwise until it locks into place.
Key alignment
Twist lock