We've just had the EICR done and they picked up a circuit that appeared live on the tester, but when the wiring was traced out the supposedly live circuit was not electrically connected to any other circuit. The only thing which I can think of is some kind of capacitive or electromagnetic pickup from adjacent live circuits. The wiring of the problem circuit ran alongside a couple of live SWA cables for about 1.5M and also crossed at right angles to a live T&E cable, apart from that it was not close to any other wiring.
Any thoughts on this, has anyone else come across dead circuits appearing live. The sparky who reported this is scratching his head, as he checked with a colleague using a different tester and the circuit appeared live. Problem has now gone away as the redundant wiring has been stripped out, but it would be nice to know how his might have happened