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Connecting the M320 Router Grounding Cable


Sub-optimal ground such as ground-loop or ground with high-impedance can result in unexpected FRU shut down. Engage a third party power consultant or certified electrician to ensure optimal grounding.

To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the 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 router to earth ground. The left pair of grounding points fits M6 screws (European), and the right pair fits UNC 1/4–20 screws (American). The grounding points are spaced at 0.625-in. (15.86-mm) centers. The accessory box shipped with the router includes the cable lug that attaches to the grounding cable (see M320 Chassis Grounding Cable and Lug Specifications) and two UNC 1/4–20 screws. For power cord and grounding cable specifications, see M320 AC Power Cord Specifications.


Before 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 router.

To ground AC and DC powered routers:

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. Connect the grounding cable to a proper earth ground.
  3. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
  4. Place the grounding cable lug over the grounding points on the bottom rear of the chassis. The left pair is sized for M6 bolts, and the right pair is sized for UNC 1/4-20 bolts.
  5. Secure the grounding cable lug to the grounding points, first with the washers, then with the screws.