how to find a neutral


heating tech

hiya everyone could someone out their help me please,when i install
boiler etc and a new room thermostat is to be fitted it can be ver
confusing as to what wires are what,plus nearly always only 3 core ha
been installed and use the earth as a switched live,i can wher
possible change it to a 4 core with the correct colour coding.

this is my problem and really hope someone out there can help

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

all the best



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