AC Power and Grounding

If the circuit is properly grounded, the ye low and white lights on the tester turn on.

2 Unplug the circuit tester.

Using a Volt-Ohm Milliammeter (VOM)

1 Set the VOM to the lowest scale on which you can read 130 V AC.

2Measure the AC outlet voltages. See Figure 2-2.

Phase to ground should be 110 to 125 V AC.

Neutral to ground should be less than 1 V AC.

Phase to neutral should be 110 to 125 V AC.

110-125 / Volts AC\

Phase

Neutral ( H O T )

 

Ground

Less than

110 - 125

1.0 Volt AC

Volts AC

 

 

 

Figure 2-2. Measuring the AC Outlet Voltages

WARNING:

If the voltage readings do not measure the values required, the AC outlet is improperly wired- do not install the system. Advise the customer to have a licensed electrician correct the problem.

Installing the Control Unit 2-9

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AT&T 3.0 manual Unplug the circuit tester, Measuring the AC Outlet Voltages