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TX Matrix Plus Chassis Grounding Specifications


To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the TX Matrix Plus router must be adequately grounded before power is connected.

Two pairs of threaded inserts (PEM nuts) are provided on the right rear of the chassis for connecting the TX Matrix Plus router to earth ground. The bottom pair of grounding points fits M6 screws (European), and the top pair fits UNC 1/4–20 screws (American). The grounding points are spaced at 0.625-in. (15.86-mm) centers.

Grounding Cable

To ground the TX Matrix Plus router, connect a grounding cable to earth ground and then attach it to the chassis grounding points using two screws. You must supply a grounding cable. The grounding cable must be able to handle up to 60 A @ –48 VDC and meet the following specifications: 4-AWG (21.2 mm2), minimum 90°C wire, or as required by the local code.

Grounding Lug

The accessory box shipped with the TX Matrix Plus router includes two UNC 1/4–20 screws used to secure the grounding cable to the right pair of grounding points and the cable lug that attaches to the grounding cable (see Figure 1). (The cable lug shown in Figure 1 is also used for the DC power cables.)

Cable lug; dual hole.

Bottom pair: sized to fit M6 grounding studs.

Top pair: sized to fit 1/4-20 UNC grounding studs.

Figure 1: Grounding Cable Lug
Grounding Cable Lug

Before TX Matrix Plus router installation begins, 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 TX Matrix Plus router (for example, by causing a short circuit).