Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Gain access to the mains input connections in the wiring center
Identify the main live terminal
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage of the mains input to the system.
Expect mains voltage
Note: The colour and position of the wires will vary between systems and components.