Possibly, but it could also be a neutral to earth fault. The neutral can
become charged if the conductor is in contact with an open live conductor.
This can happen through an appliance that has a low enough resistance that
allows a high enough current out through the neutral and the neutral side of
the appliance has come into contact with the earth conductor. Because of
the resistance taking some of the oomph out of the current, it then gives
enough charge to give the symptoms you describe.
Yoe say that this fault has only reared it head since doing work on the
lighting circuits, so my first thoughts are that you've left something on
the circuit you were working on, which is now leaking out through the earth
conductor. The best way to find the fault is to place a meter over neutral
and earth and see what kind of reading you get. Then switch the circuits
off at the consumer unit one by one until you find the circuit that is
causing the leak to earth.
If none of the circuit being switched off cure the problem, then you're
looking at a leak to earth from the mains supply side of your system.
You may also find that the fault is occuring only when one particular
appliance or light is switched on or off, so you would then be able to
narrow the fault down to somewhere on that one circuit.
There is no real way of telling if this fault would create enough of
anything so you could make a warning system to detect it. Just make sure
that all the safety systems installed in appliances, in plug tops and in the
consumer unit are all rated correctly for the circuits they control.
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