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Chassis Grounding

Caution: Before services gateway installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway.

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the services gateway must be adequately grounded before power is connected. To ground AC-powered and DC-powered services gateways, you must connect a grounding cable to earth ground and then attach it to the chassis grounding points using the two screws provided.

Two threaded inserts (PEM nuts) are provided on the upper rear of the chassis for connecting the services gateway to earth ground (see Figure 35). The grounding points fit UNC 1/4–20 screws (American). The grounding points are spaced at 0.625-in. (15.86-mm) centers.Figure 35, or Figure 36).

Note: Additional grounding is provided to an AC-powered services gateway when you plug its power supplies into grounded AC power receptacles.

Caution: Power cords and cables must not block access to services gateway components or drape where people could trip on them.

Grounding Cable Lug Specification

The accessory box shipped with the services gateway includes the cable lug that attaches to the grounding cable (see Figure 73) and two UNC 1/4–20 screws used to secure the grounding cable to the grounding points.

Figure 73: Grounding Cable Lug

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Caution: Before services gateway installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the services gateway.

Grouding Cable Specification

The grounding cable that you provide must be 6-AWG (13.3 mm2), minimum 60°C wire, or as permitted by the local code.

Warning: The services gateway is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for UNC 1/4-20 ground lugs) 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.


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