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CHAPTER 5: INSTALLING THE SWITCH
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FIGURE 5-6. FRONT RACK INSTALLATION
NOTE: Do not the use the mounted rails as a shelf or a workplace.
5.4 GROUND CABLE
Depending on the type of system, to attach a ground cable to the chassis, you need one of the included M3 or M4 screws.
The system ships with one of the following two configurations:
One threaded hole using an included M3 screw.
Two threaded holes using one of the two included M4 screws.
In both configurations, the ground cable is not included. To properly ground the chassis, Black Box recommends a one- or two-hole
lug, M3 or M4 hole size. The system hole 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.
NOTE: The rack installation ears are not suitable for grounding.
To connect the ground cable to the system, follow these steps.
1. Remove the ground cable from the shipping bag and cut it to the desired length. The cable length must facilitate proper
operation of the fault interrupt circuits. Use the shortest cable route allowable.
2. To attach the ground cable, use one of the following:
Using one threaded M3 hole, attached the ground cable to the lug using an M3 screw with a captive internal tooth lock washer, as
shown. Torque the screw to ±4-5 in-lbs.
Using one of the two M4 threaded holes, attach the ground cable to the lug. Use an M4 screw with a captive internal tooth lock
washer, as shown. Torque the screw to ±5-6 in-lbs.
3. 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.
