Cisco VG224 Hardware Installation Guide - Page 44

Installing the Ground Connection Chapter 3 Installing the Cisco VG224 Voice Gateway • For EN/IEC 60950-compliant grounding, use size AWG 18 (1 mm2) or larger wire and an appropriate user-supplied ring terminal. To ground the chassis, follow this procedure: Step 1 Locate a suitable ground location. Tip Use a multimeter to measure the resistance between various ground locations, such as the following: • Between the ground of a junction box (outlet) and the ground of a power tap • Between the ground of a junction box and a metal water pipe • Between the Cisco VG224 voice gateway chassis and the ground of a power tap • Between the Cisco VG224 voice gateway chassis and the ground of a junction box A good ground connection should read between 0.0 and 0.5 ohms. Step 2 Step 3 Strip one end of the ground wire to the length required for the ground lug or terminal. • For the NEBS ground lug-approximately 0.75 in. (20 mm) • For user-provided ring terminal-as required Crimp the ground wire to the ground lug or ring terminal, using a crimp tool of the appropriate size. (See Figure 3-9.) Figure 3-9 Crimping a Ground Lug onto the Ground Wire 10360 Step 4 Attach the ground lug or ring terminal to the chassis as shown in Figure 3-10 or Figure 3-11. For the ground lug, use the two screws with captive locking washers provided. For a ring terminal, use one of the screws provided. Use a number 2 Phillips screwdriver, and tighten the screws to a torque of 8 to 10 in-lb (0.9 to 1.1 N-m). Note You can orient the crimped end of the ground lug in either direction (right or left). Step 5 Connect the other end of the ground wire to a grounding point at your site. 3-12 Cisco VG224 Voice Gateway Hardware Installation Guide OL-5006-04