ADC PowerWorx Power Distribution Products - Manual (Page 22)

ADCP-80-545 • Issue 3 • March 2006
Page 16
© 2006, ADC Telecommunications, Inc.
3.3 Chassis Ground Connections
Mounting the circuit breaker panel on a grounded metal equipment rack using the metal
mounting brackets provided generally provides a sufficient return path to meet equipment
grounding requirements. However, installation of a separate grounding conductor is strongly
recommended and is often required by local practice or local inspectors. A separate grounding
conductor is always needed when the panel is mounted to non-grounded or non-conducting
material such as a plastic rack or cabinet.
Use the following procedure to connect the panel to an approved office ground source:
1. Obtain two lengths of #10 AWG wire for use as the chassis grounding wires.
2. Terminate one end of each wire with the #10 ring terminals provided (requires crimper).
3. Locate the C GND (chassis ground) studs at the rear of the panel as shown in Figure 9 .
4. Connect the ring terminal end of each wire to one of the studs and secure using the nuts
with captive star washers provided (requires 3/8-inch socket). Tighten each stud nut to 23
pound-force inches (2.6 Newton meters) of torque.
Figure 9. Chassis Ground Connections
5. Route the free end of each chassis grounding wire to an approved office ground source.
6. Cut each chassis grounding wire to length and connect it to the office ground source as
required by local code or practice.
3.4 External Alarm System Connections
Normally open (NO) and normally closed (NC) alarm contacts are provided for connecting the
circuit breaker panel to an external alarm system. Alarm connections are provided through
either screw-down terminals or wire-wrap pins (option) located on the rear side of the panel as
shown in
Figure 10 . One set of terminals, labeled ALARM, is provided for reporting either a
power failure or tripped circuit breaker alarm.
DETAIL DRAWING
OF GROUNDING
WIRE CONNECTION 17932-A
TIGHTEN STUD NUT TO
23 POUND-FORCE INCHES
(2.6 NEWTON METERS)
OF TORQUE