AT&T 3.0 manual Grounding Requirements

AC Power and Grounding

Grounding Requirements

Proper grounding of the installation site safeguards the system by protecting it from the following:

■Lightning

■Power surges

■Power crosses on central office trunks

■Electrostatic discharge (ESD)

When installing the control unit, make sure you meet the following grounding requirements:

The control unit, the central office trunk protector, and the AC power service panel should be as close to each other as possible.

Because equipment can be located throughout a building, the National Electrical Code requires that the ground point for the central office trunk protector be bonded to the AC power ground as shown in Figure 2-3.

The AC outlet and the single-point ground bar must be properly grounded as shown in Figure 2-1and Figure 2-3.

Each power supply in the control unit must be connected to the single- point ground bar by a #12 AWG or a #14 AWG solid copper wire. Figures 2–1and 2–3show this connection.

This wire run should be as short as possible, preferably within 5 ft. (152 cm), not to exceed 10 ft. (305 cm), See “Approved Grounds,” later in this chapter, for more information.

The AC outlet must be connected to the 147A protector with#12 AWG or a #14 AWG solid copper wire.

2-10Installing the Control Unit