I have a bathroom pull cord that I would like to change to a flush mounted PIR. However on pulling down the existing pull core I find three wires - two of which are in one terminal and the other on its own.
The colour of the cables are all the same too - red with green on them - the house is approx 30 years old.
How do I identify which is live and which is neutral so that I can connect up the PIR?
Thank you in advance.