Background:- the electrical supply to my house is TT with an earth rod at the premises. The consumer unit itself has rewireable fuses.
At one location on the 5A circuit of 1.0mm cable for the downstairs lights there was an old round bakelite-type JB to split the cable into two spurs - one to go to the front of the house and the other to he back. This was used as a straight-forward 3-way JB, no spurs to any switches or lights. At some stage the box has cracked, so while I had the floor up for some other work I removed it and replaced it with a Hager J804.
With the circuit fuse removed (before I started!) and testing with a multimeter afterwards there was about 0.3 Ohm resistance from E to the E on a different nearby circuit, so happy with the ECC continuity. There was NO reading between the L and E, so happy again. However when checking from N to E, although the meter gave no actual reading, the audio signal buzzed rather erratically as though there was some sort of intermittent connection.
Now, I don't recall that having happened before when testing N-E when (for example) replacing some old sockets or light fittings in the past. All that I've done on this occasion is swop out one JB for another JB and re-trimmed the cable ends. Having read other threads about N-E resistance, I'm not sure whether or not I should have any concern here and if so, why might this have happened so unexpectedly?
At one location on the 5A circuit of 1.0mm cable for the downstairs lights there was an old round bakelite-type JB to split the cable into two spurs - one to go to the front of the house and the other to he back. This was used as a straight-forward 3-way JB, no spurs to any switches or lights. At some stage the box has cracked, so while I had the floor up for some other work I removed it and replaced it with a Hager J804.
With the circuit fuse removed (before I started!) and testing with a multimeter afterwards there was about 0.3 Ohm resistance from E to the E on a different nearby circuit, so happy with the ECC continuity. There was NO reading between the L and E, so happy again. However when checking from N to E, although the meter gave no actual reading, the audio signal buzzed rather erratically as though there was some sort of intermittent connection.
Now, I don't recall that having happened before when testing N-E when (for example) replacing some old sockets or light fittings in the past. All that I've done on this occasion is swop out one JB for another JB and re-trimmed the cable ends. Having read other threads about N-E resistance, I'm not sure whether or not I should have any concern here and if so, why might this have happened so unexpectedly?