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Connecting the T320 Grounding Cable


To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the T320 router must be adequately grounded before power is connected.

You must provide the grounding cables. For grounding cable specifications, see T320 Chassis Grounding Cable and Lug Specifications. The accessory box shipped with the router includes the cable lug that attaches to the grounding cable and two UNC 1/4–20 screws.

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.


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.

  1. Connect the grounding cable to a proper earth ground.
  2. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding cable.
  3. Make sure that grounding surfaces are clean and brought to a bright finish before grounding connections are made.
  4. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing Electrostatic Discharge Damage to a T320 Router.
  5. Place the grounding cable lug over the grounding points.The left pair is sized for M6 bolts, and the right pair is sized for UNC 1/4-20 bolts.
  6. Secure the grounding cable lug to the grounding points, first with the washers, then with the screws.
  7. Verify that the grounding cabling is correct, that the grounding cable does not touch or block access to router components, and that it does not drape where people could trip on it.