18
Grounding the Chassis
Use the information in this section to provide proper ground for the Cisco IAD2400 series IADs.
You must connect the chassis to a reliable earth ground; the ground wire must be installed in accordance with local electrical
safety standards.
•
For NEBS-compliant grounding, use size AWG 6 (13 mm
2
) wire and the ground lug provided in the accessory kit.
•
For NEC-compliant grounding, use size AWG 14 (2 mm
2
) or larger wire and an appropriate user-supplied ring terminal.
•
For EN/IEC 60950-compliant grounding, use size AWG 18 (1 mm
2
) or larger wire and an appropriate user-supplied ring
terminal.
To connect the chassis to a reliable earth ground, follow these steps:
Step 1
Locate a suitable ground.
Tip
Using a multimeter, measure the resistance between various possible ground locations, such as between the ground of
a junction box (outlet) and the ground of a power tap, between the ground of a junction box and a metal water pipe,
between the Cisco IAD chassis and the ground of a power tap, and between the Cisco IAD chassis and the ground of a
junction box. A good ground connection should read between 0.0 and 0.5 ohm.
Step 2
Strip one end of the ground wire to the length required for the ground lug or terminal.
•
For the NEBS ground lug—approximately 0.75 inch (20 mm)
•
For user-provided ring terminal—as required
Step 3
Crimp the ground wire to the ground lug or ring terminal, using a crimp tool of the appropriate size.
Step 4
Attach the ground lug (Figure 16 and Figure 17) or ring terminal (Figure 18) to the chassis. For the ground lug, use the
two screws with captive locking washers provided. For a ring terminal, use one of the screws provided. Use a
number-2 Phillips screwdriver, and tighten the screws to a torque of 8 to 10 in-lb (0.9 to 1.1 N-m).
Note
For chassis with ground lugs, attach the ground lug to the chassis as shown in Figure 16 and Figure 17.
Figure 16
NEBS-Compliant Chassis Ground Connection Using Ground Lug
88844
Ground lug
