Step 3: Connect the Grounding Cable
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must ground the router properly before connecting power.
You need a protective earthing terminal bracket for connecting the chassis to earth ground. This two-holed bracket attaches on the side of the chassis through the mounting rail and provides a protective earthing terminal for the router. The grounding points are in the form of studs sized for #10–32 pan head screws. (You need to provide these screws with integrated washers as we do not ship them in the accessory kit). The grounding points are spaced at 0.63-in. (16-mm) centers.
You ground the router by connecting a grounding cable to earth ground and then attaching it to the chassis grounding points by using two #10–32 pan head screws. You must provide the grounding cables.
The grounding lug required is a Panduit LCD10-10A-L or equivalent (not provided). The grounding lug accommodates 12 AWG (2.5 mm²) stranded wire. The grounding cable that you provide for the chassis must be the same size or heavier than the input wire of each PSM. We recommend the following minimum standards:
12 AWG (2.5 mm²), 60° C temperature-rated stranded wire for the ACX5448 router.
12 AWG (2.5 mm²), 90° C temperature-rated stranded wire for the ACX5448-D and ACX5448-M routers
To ground the ACX5400 router:
- Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
- Ensure that all grounding surfaces are clean and brought to a bright finish before grounding connections are made.
- Connect the grounding cable to a proper earth ground.
- For ACX5448-M routers, remove the dummy screws from the grounding point (see Figure 35).
- Place the grounding cable lug over the grounding points on the side of the chassis (see Figure 34 for ACX5448 and ACX5448-D routers and Figure 35 for the ACX5448-M router).
- Secure the grounding cable lug with the screws. The holes are sized to accommodate #10–32 pan head screws.
- Dress the grounding cable and verify that it does not touch or block access to router components, and that it does not drape where people could trip over it.