Electric shock in the sauna: how to find the cause and eliminate it

Igor asks:

It shocks in the sauna if you give the park a good shot. There is a two-pole automatic machine on Kamenka, a single-pole one for lighting, there is no RCD. If you turn off the stove, it still hits. So it's the lighting... The walls and ceiling are sheathed with foil. Two lamps are connected in parallel.

One is in a gas-moisture-proof shade, the second is not yet. The ends of the second wire are insulated with heat shrink sleeves and well wrapped with electrical tape. Shocks if you stand on the (wooden) floor and grab a broom or a ladle, a bowl of water. Shakes well when touched on foil.

However, nothing happens in a dry bath. Heat-resistant wires for light 1.5 mm². How to find a leak with a multimeter? The circuit breaker only disconnects the phase. Can I supply a 12V transformer? Tell me which one? All the same, a steam room ...

Perhaps during the installation of the wiring somewhere the integrity of the insulation was violated. The foil can be grounded, you won't cover it with anything (clapboard, for example)? Install an RCD and make grounding. Put the transformer at 12-36 volts. In general, in the bathhouse, if done "according to the mind", then there should be low-voltage lighting. In the sense of "What?" suitable for power. Buy a box YATP 220-12 with the required power and that's it.

You can't find a leak with a multimeter. You can only "ring" the wire or measure the resistance to metal parts, for example with the same foil. But it will not work to localize the place of insulation damage. The leak is better determined by a megohmmeter. Although if the wiring is external, then you can find a leak if you ring the cable on the foil and move the cable itself, when the leak disappears - remember which section of the cable was "moved" from the ceiling.

Moreover, in a dry bath, you say everything is fine. Perhaps the problem manifests itself not only at high humidity, but also at high temperatures. What cable was laid? If VVG - then it is not intended for a bath.