Hi
I am fairly new to being an electrician and have come across my first shared neutral. Can anyone help with a strategy for getting rid of it before installing an MCB.
The term borrowed neutral can be a little confusing as often it is a borrowed line in real terms.
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The "traditional" borrowed neutral associated with up/down lighting splits resulted in the landing light getting its switched live from the downstairs circuit.I have a house with two single phase supplies (off a three phase). On one I have put in a new lighting circuit for upstairs which led me to finding the shared neutral as the downstairs lights gave me a problem on the continuity tests.
It's not just RCDs you need to worry about - if you've got lighting circuits on different phases and you have borrowed/shared neutrals/lines (however you want to view it) you'll have 400V at affected ceiling roses, lamps suddenly in series between two phases if you disconnect a neutral....For the other part of the house I have two light circuits, not upstairs and downstairs but right and left parts of the house. I will have to investigate that this has not been shared as the circuits will be on separate RCDs in a split load CU.
What do you mean?From your note, is it common for the circuits to be connected at the switch? Would you expect the circuits to be connected in the cable run?
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