hiya everyone could someone out their help me please,when i install a boiler etc and a new room thermostat is to be fitted it can be very confusing as to what wires are what,find the live no problem but alot of installations i see is where someone has only fitted 3 core cable and use the earth wire as a switched live if thats the case always tag the switched live to warn others,when i install a complete heating system and full controls always use 4 core ,

here is my problem which i really hope someone can help please



please can someone help how do you get a true test to find the neutral i would be extremly grateful if someone could just clear this frustrating question up please.

all the best