Dell S4112F EMC S4112–ON Series Installation Guide October 2021 - Page 20

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. 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 must be made of copper. Do not use aluminum 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. Before you install the switch into the dual-tray: 1. 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. 2. Unscrew the two attached M4 screws and set aside. 3. Attach the ground lug and bracket to the switch using the M4 screws. 4. 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. 5. 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. Rack or cabinet installation You may either place the switch on a rack shelf or mount the switch directly into a 19" wide, EIA-310- E-compliant rack. The dual-tray mounting rails ship with the dual tray, not the switch. WARNING: This guide is a condensed reference. Read the safety instructions in your Safety, Environmental, and Regulatory information booklet before you begin. NOTE: The illustrations in this section are not intended to represent a specific switch. NOTE: Do not the use the mounted rails as a shelf or a workplace. Rack mount safety considerations ● Rack loading-Overloading or uneven loading of racks may result in shelf or rack failure, possibly damaging the equipment and causing personal injury. Stabilize racks in a permanent location before loading begins. Mount the components starting at the bottom of the rack, then work to the top. Do not exceed your rack's load rating. ● Power considerations-Connect only to the power source specified on the unit. When you install multiple electrical components in a rack, ensure that the total component power ratings do not exceed the circuit capabilities. Overloaded power sources and extension cords present fire and shock hazards. ● Elevated ambient temperature-If you install the switch in a closed rack assembly, the operating temperature of the rack environment may be greater than the room ambient temperature. Use care not to exceed the 45°C (113°F) maximum ambient temperature of the switch. ● Reduced air flow-Do not compromise the amount of airflow required for safe operation of the equipment. Install the equipment in the rack so that the equipment constantly has the correct amount of airflow surrounding it. ● Reliable earthing-Maintain reliable earthing of rack-mounted equipment. Pay particular attention to the supply connections other than the direct connections to the branch circuit, for example: use of power strips. ● Do not mount the equipment with the fan panel facing downward. 20 S4112-ON Series installation