MX2000 Router Grounding Specifications
MX2000 Series Chassis Grounding Points Specifications
To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the router must be adequately grounded before power is connected. To ground AC-powered or DC-powered routers, you must connect a grounding cable to earth ground and then attach it to one of the chassis grounding points using the two screws provided. (see Figure 1).
MX2000 Series Router Grounding Cable Lug Specifications
Before you install the router, 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 router.
The chassis has two grounding points. The upper pair is sized for UNC 1/4-20 nuts, and the lower pair is sized for M6 nuts. You only need to connect to one of the grounding points to properly ground the router. The grounding points are spaced at 0.625-in. (15.86-mm) centers. To ground the router, attach cable lugs to the grounding cable and secure the grounding cable to a grounding point on the chassis with two screws. The router is shipped with two Standard UNC 1/4–20 screws for connecting to the top (left) pair of grounding points.
The router is a pluggable type A equipment installed in a restricted access location. It has a separate protective earthing terminal (Metric [–M6] and Standard [–¼-20] screw ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earth terminal must be permanently connected to earth.
Table 1 summarizes the specifications for the power cables, which you must supply.
Table 1: DC Power Cable Specifications
Quantity and Specification
Eighteen pairs of 4-AWG (21.2 mm2), used with 80-A PDM. Minimum 90°C wire, or as required by the local code
Eighteen pairs of 6-AWG (13.3 mm2), used with 60-A PDM. Minimum 90°C wire, or as required by the local code
MX2000 Series Router Grounding Cable Specifications
The 48 VDC facility must be equipped with a circuit breaker rated 60 A (–48 VDC), or 80 A (–48 VDC) for each PDM input, and the grounding cable must be minimum 10 AWG, or as required by the local code.
Additional grounding is provided to an AC-powered router when you plug its PDMs into grounded AC power receptacles.
The router is installed in a restricted-access location. It has a separate protective earthing terminal (Metric [–M6] and Standard [–¼-20] screw ground lugs) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earth terminal must be permanently connected to earth.