Set Appliance State:

Mains Power Off
Gas Off
Set Multimeter to AC Voltage Set meter to measure AC Volts
On/Off Switch Off.
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure Mains Voltage across the Live
(Brown wire, marked PERMANENT L)
and the Neutral (Blue wire, marked PERMANENT N)
on the main connector block.