Dell EMC S4112-ON Serie Guia De Instalacion página 15

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Ground cable

NOTE: For an AC-powered switch, although the third conductor of the AC power

cord provides a ground path, Dell EMC recommends grounding your switch with

a dedicated ground wire.

NOTE: For a DC-powered switch, the only way to safely ground your switch is to

attach a dedicated ground wire. The ground lug kit ships in a plastic bag placed

with the other accessories inside the shipping box. The ground lug bracket

screws ship attached to the switch. Before you install the DC switch in the dual-

tray, attach the ground lug and bracket to the switch using the included screws

and then attach the DC ground wire to the ground lug.

NOTE: The S4112-ON Series has a DC power source rated -40 to -72 VDC, 6A

minimum, Tma=40C, and an altitude operation of 3048m. The power cable is

10AWG, 16A minimum, with a 72V minimum rating.

The ground cable is not included. To properly ground the chassis, Dell EMC recommends a

one- or two-hole lug, M4 hole size. The ground lugs must be a UL-recognized, crimp-type

lug.

CAUTION: Grounding conductors

conductors.

NOTE: Coat the one-hole lug with an anti-oxidant compound before crimping.

Also, bring any unplated mating surfaces to a shiny finish and coat with an anti-

oxidant before mating. Plated mating surfaces must be clean and free from

contamination.

NOTE: The rack installation ears are not suitable for grounding.

Before you install the switch into the dual-tray:

Cut the ground cable (not included) to the desired length. The cable length must

facilitate proper operation of the fault interrupt circuits. Use the shortest cable route

allowable.

Unscrew the two attached M4 screws and set aside.

Attach the ground lug and bracket to the switch using the M4 screws.

Using one of the two M4 threaded holes, attach the ground cable to the lug. Use the

M4 screw with a captive internal tooth lock washer. Torque the screw to ±5-6 in-lbs.

Attach the other end of the ground cable to a suitable ground point such as the rack

or cabinet.

The rack installation ears are not a suitable grounding point.

must be made of copper. Do not use aluminum