8 Installing the Hardware
Attach a Ground Cable to the C150/300 DC
Chassis
WARNING: You must complete the ground connection before proceeding
with any DC PEM connection.
The AC power cord is the primary ground connection for C-Series AC chassis.
This procedure applies to the DC powered chassis only.
You must provide your own cables to connect to a remote power source (a
circuit breaker panel, for example) in your equipment rack or facility. Cables
must be sized to meet the following criteria:
• Rated for 60A service to allow for a fully loaded C150 system per NEC in the
United States or internationally, per local safety codes.
• Limit voltage drop across the cable length to 0.5V or less.
NOTE: Apply a coat of anti-oxidant paste to unplated metal contact
surfaces before you make the cable connections. File unplated connectors,
braided straps, and bus bars to a shiny finish. It is not necessary to file and
coat tinned, solder plated, or silver-plated connectors or other plated
connection surfaces, such as those on the PEM studs.
Step Task
1 Locate the chassis ground connector stud on the PEM front panel. It is
the single stud below the safety cover.
2 Remove the nut and washer from the ground stud.
3 Apply a coat of anti-oxidant paste to the connector stud, if required.
4 Install the grounding cable. This cable is typically green or green and
yellow.
NOTE: Termination points require UL-listed 1-hole lug with a
1/4-inch hole.
5 Replace the washer and nut on the stud.
6 Secure the nut with a nut driver or torque wrench (not to exceed 4
ft/lbs).
7 Connect the opposite end of the grounding cable to the appropriate
nearest grounding.
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