•
Use a high-quality return and safety ground cable, no smaller than #8 AWG stranded for
-48 V.
•
Use two 10-32 x 3/8" pan head screws. The torque should be between 2.8 and 3.4 Nm
(25 and 30 lbf-in).
4.
Connect the other end of the frame-ground cable to a high-quality facility ground
connection. Do not use a power strip, connect directly to the power source.
Failure to connect to a high-quality ground connection may reduce the performance and
availability of the chassis and the equipment that connects to it. Improper grounding may
increase electrical noise in the chassis, causing data loss and other performance
degradation.
5.
Verify power distribution to power-feed cables is disconnected.
6.
Switch the toggle switch circuit breakers on the right PEM (PEM R) and the left PEM (PEM L)
to the OFF position.
7.
Route two power-feed cables to the area behind the chassis, but do not yet attach them to a
power connection.
8.
Use a Phillips screwdriver to remove the #6 screw on the PEM's safety cover. Set the screw
aside. Remove the safety cover to expose the power connectors.
9.
Use a 7/16" wrench to remove the 1/4-20" top nuts and star washers from each of the power
Chapter 7: Connecting Power
27
