ADCP-80-524 • Issue 1 • November 2001

4.7Chassis Ground Connection

Mounting the fuse panel on a metal equipment rack using the metal mounting brackets provided with the fuse panel provides a sufficient return path to meet equipment 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 fuse panel is mounted to non-grounded or non-conducting material such as a plastic rack or cabinet. When the panel requires separate chassis grounding, the chassis grounding conductor must be sized to match the upstream protection device feeding the panel. This provides an adequate return path capable of allowing the fuse to fail in the unlikely event of a battery wire to chassis fault.

Connect one or both of the chassis ground connectors (labeled C. GND) to the equipment rack ground (see Figure 19), using the following chassis grounding recommendations:

•Chassis grounding conductor connection point: Two #10 studs (with nuts) on 0.625 inch (15.875 mm) centers are provided for connecting a grounding conductor to the fuse panel.

•Chassis ground conductor: Use two #10 AWG wires if using both chassis ground connectors or one #6 AWG wire if using one chassis ground connector. Two #10 crimp ring terminals (for use with #10 AWG wires) are included with the fuse panel.

•Place the ring terminals over the chassis grounding studs and tighten the stud nuts to approximately 15 pound-force inches (1.7 Newton meters) of torque.

•Connect the ground conductors to an approved office ground source per local code or practice.

USE TWO #10 AWG WIRES IF USING BOTH CHASSIS GROUND CONNECTORS OR ONE #6 AWG WIRE IF USING ONLY ONE CHASSIS GROUND CONNECTOR.

TWO #10 CRIMP RING TERMINALS FOR ATTACHING THE #10 WIRES TO THE CHASSIS CONNECTORS ARE PROVIDED WITH THE FUSE PANEL.

PLACE THE RING TERMINALS OVER THE CHASSIS SCREWS AND TIGHTEN THE NUTS DOWN ON THE TERMINALS. IF NOT USING TERMINALS, WRAP THE WIRE(S) AROUND THE CHASSIS SCREW(S) AND TIGHTEN THE NUTS DOWN ON THE WIRES. CONNECT THE WIRE(S) TO THE EQUIPMENT RACK.

GROUND SCREW AND NUT

GROUND SCREW AND NUT

 

16160-A

Figure 19. Chassis Ground Connection

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© 2001, ADC Telecommunications, Inc.