Chassis Ground Connection - ADC PowerWorx Select Series User Manual

ADCP-80-531 • Issue 4 • July 2004
Caution: Connect only the input voltage wire (labeled BATTERY, BATT, NEGATIVE,
NEG, or – and/or the voltage value) to the connector on the circuit breaker panel labeled BATT
(battery). Connect only the input return wire (labeled RTN, RETURN, POSITIVE, POS, +, or
BATTERY GROUND) to the connector on the circuit breaker panel labeled RTN (return). If
the wires are reversed, voltage could be present on the circuit breaker panel chassis and current
could flow through the unprotected return wiring in the circuit breaker panel. This condition
causes damage to equipment in the frame in which the circuit breaker panel is installed and to
equipment in adjacent frames!
CONNECT TO
BUS B BATTERY*
CONNECT TO
BUS B RETURN**
4.7

Chassis Ground Connection

Mounting the circuit breaker panel on a metal equipment rack using metal mounting brackets as
described in
grounding requirements. However, a separate grounding conductor is often required by local
practice or local inspectors. A separate chassis grounding conductor is always needed when the
circuit breaker panel is mounted to non-grounded or non-conducting material, e.g., a plastic
rack or cabinet. When the panel requires separate chassis grounding, the chassis grounding
conductor is sized to match the upstream protection device feeding the panel. This provides an
adequate return path capable of allowing the circuit breaker to fail in the unlikely event of a
battery wire to chassis fault.
Page 22
© 2006, ADC Telecommunications, Inc.
CONNECT OUTPUT
POWER TERMINALS
TO OUTPUT
POWER CIRCUITS
OUTPUT
POWER
CONNECTORS
OUTPUT
LANCE FOR
RETURN
SECURING
CONNECTORS
INPUT CABLES
CONNECT OUTPUT
RETURN TERMINALS
TO OUTPUT
RETURN CIRCUITS
*NOTE: CONNECT INPUT VOLTAGE WIRE LABELED "BATTERY," "BATT," "NEGATIVE," "NEG," OR "-"
AND/OR THE VOLTAGE VALUE TO THE "BATT" CONNECTOR ("HOT" WIRE).
**NOTE: CONNECT INPUT RETURN WIRE LABELED "RTN," "RETURN," "BATTERY GROUND,"
"POSITIVE," "POS," OR "BATTERY GROUND" TO THE "RTN" CONNECTOR.
Figure 13. Rear View of Circuit Breaker Panel Cabling
(Panel with Wire Wrap Alarm Connection Shown)
Section 4.5, Rack Mounting, provides a sufficient return path to meet equipment
CONNECT OUTPUT
POWER TERMINALS
TO OUTPUT
CONNECT REMOTE
POWER CIRCUITS
ALARM TERMINALS
TO REMOTE ALARMS
OUTPUT
POWER
CONNECTORS
OUTPUT
RETURN
CONNECTORS
CONNECT OUTPUT
RETURN TERMINALS
CONNECT TO
TO OUTPUT
EQUIPMENT
RETURN CIRCUITS
RACK
CONNECT INPUT
CONNECTOR TO
BUS A BATTERY*
16763-B
LANCE FOR
CONNECT INPUT
SECURING
CONNECTOR TO
INPUT CABLES
BUS A RETURN**