IBM x3550 Problem Determination And Service Manual page 88

remove the -48 volt power cable. The customer is responsible for ensuring that only
trained service personnel install or remove the -48 volt power cable.
If you are using terminal screws, see the documentation that came with the terminal
for the torque requirements.
Use this document with the documentation that comes with the IBM System x3550
server. The information in this document replaces the instructions in the server
documentation for connecting and disconnecting the power cable from the rear of
the server.
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IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide