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 PCB as necessary
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Test 1:
Measure the AC voltage between Live (L) on the incoming mains terminal block and earth.
Expect approximately 240 VAC
Test 2:
Measure the AC voltage between the Neutral (N) on the incoming mains terminal block and earth.
Expect approximately 0-15 VAC