Identifying which cable

[andyv1]

Not foolproof, but isolate all circuits but the immersion circuit. You will need a non-contact voltage stick/pen. Then you can test each cable individually for voltage. but make sure you have the cable being tested a good distance from the rest. Once you pick up a voltage, you then turn that circuit off, test again this time for no voltage. Then turn all circuits back on, other than the immersion and test that it remains dead!

Then hopefully that will ID the circuit, but when splicing into it, again isolate all circuits. Then once spliced, you can then do an r1+r2 on it, to establish you have the correct circuit!

Many thanks. What I was really looking for is the reference to the voltage pen, so now I know what it's called I can order one.

 

[securespark]

There are many on the market.

https://lmgtfy.com/?q=Non-contact+voltage+detectors