The test tube is lit at "zero" - what does that mean?

zubel wrote:

Currently, in multi-family buildings, some of the installations are run in the floor. The floor is reinforced with a steel wire mesh and under certain conditions the floor with respect to N is simply "live" and the neon lamp will show it. It will also light up on the pin in the socket. Sometimes the neon light applied to the wall also lights up and this does not indicate a faulty installation.

zubel wrote:

After all, I wrote clearly. If the floor or wall are live, the neon lamp will shine on N or PE. No matter which end of the neon you touch to the "phase"

pitnit wrote:

The neon lamp will glow on the PE conductor if there is no continuity in the front. (Not connected) There is something like capacitive reactance and therefore a potential difference appears on the PE conductor. You can do a little experiment even with a 3-wire cable, when we connect L and N and we do not connect PE, touching the end of the PE wire, the test tube will glow.

wahoo wrote:

Hello. I have been following the topic for some time but I have not found a specific solution in it. I made the installations. The test tube is still lit. Nothing is happening to the installation or to the devices. Maybe this information will help someone.

kkas12 wrote:

In order to receive a fairly precise answer, a precise question should be asked. We do not know if the installation has a PEN conductor or PE and N conductors?
On the other hand, the first advice given should recommend checking the SWZ condition in bad nests. Such measurement will help direct the search. You should also take into account the possibility of damaging the insulation of wires in the installation laid on the lower floor. In this case, tension may remain on the ground.

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