Grounding Cable and Lug Specifications for EX4500 Switches
For installations that require a separate grounding conductor to the chassis, the switch must be adequately grounded before power is connected to ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements. To ground an EX4500 switch, connect a grounding cable to earth ground and then attach it to the chassis grounding points.
 | Caution: For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the switch chassis to connect to earth ground. Before switch installation begins, a licensed electrician must attach a cable lug to the grounding cables that you supply. See Connecting Earth Ground to an EX Series Switch. A cable with an incorrectly attached lug can damage the switch. |
A pair of threaded inserts (PEM nuts) is provided on the left side towards the rear corner of the chassis for connecting the switch to earth ground. The grounding points fit UNC 10-32 screws. The grounding points are spaced at 0.625 in. (15.86 mm).
The grounding cable that you provide for an EX4500 switch must be 14 AWG (2 mm2), minimum 90°C wire, or as permitted by the local code.
 | Note: Grounding is provided to an AC-powered switch when you plug its power supplies into grounded AC power receptacles. |
 | Warning: The switch is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth ground for installations that require a separate grounding conductor to the chassis. |
