Installing the Control Unit

Step 5: Providing the Proper Grounding

As discussed earlier under “Power and Grounding,” the power supply on each carrier (basic and expansion) must be grounded.

WARNING:

Grounding circuit continuity is vital for safe operation. There is a risk of electric shock if the system is not properly grounded.

Follow these steps to properly ground the control unit power supplies (see Figures 2-1and 2-3):

a.Attach a #12 AWG or #14 AWG solid copper ground wire to the grounding screw on each power supply.

b.Connect the other end of each ground wire to the terminals of the single-point ground bar on the AC outlet box.

2-52Installing the Processor

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AT&T Release 2.0 manual Providing the Proper Grounding