AT&T MERLIN LEGEND Installation & Maintenance Manual page 102

Preparation
WARNING:
Hazardous voltages are present during the following tests.
Use care when working with AC power line voltages.
Using an Ideal 61-035 Circuit Tester (or equivalent)
1. Plug the circuit tester into the outlet to be tested. If the circuit
is properly grounded, the yellow and white lights on the tester
will go on.
2. Unplug the circuit tester.
Using a Volt-Ohm Milliammeter (VOM)
1. Set the VOM to the scale on which you can read 130 VAC.
2. Measure the AC outlet voltages (see Figure 11):
Phase to ground should be 110 to 125 VAC.
Neutral to ground should be less than 2.5 VAC.
Phase to neutral should be 110 to 125 VAC.
If the voltage readings do not measure the values required, the
AC outlet is improperly wired.
WARNING:
If the AC outlet test shows an improper ground, do not
install the system. Advise the customer to have a licensed
electrician correct the problem.
2-10 Power and Grounding