I am in Belgium and houses here have 230 V. I replaced a light switch recently and it had one spot for the live wire and one for the neutral. I used my multimeter to try to determine which wire was live. Both wires are black and have no markings on them.
First, I touched the black prong of the multimeter to one of the wires and the red prong to the other. My multimeter showed ~230 V. I swapped which prong was on which wire and it showed ~230 V again. I think this is to be expected as I was simply completing the circuit.
Next, I touched the black prong to ground on a nearby electrical outlet and the red prong to one of the light switch wires. It showed 110 V. I then touched the red prong to the other wire and it showed 190 V.
I was expecting one wire to show 230 V and the other to show 0 V.
I have very little electrical knowledge and barely know how to use my multimeter but like trying to learn things and fix things if it's within my abilities.
Do these results mean I have a faulty ground in my house and therefore need to call an electrician?
Or is the 110 V vs. 190 V normal in some way I don't understand? And if so, do I assume that 190 V is the live wire?
Edit: Here's a video of me measuring the voltages of each wire with my multimeter. I'm touching the black prong to a grounding prong on an electrical outlet out of view. I would assume that if my multimeter is of low quality or is defective, both wires wouldn't register a voltage. I also think that static emanating from the wires wouldn't register the 110 and 190 voltages consistently, even after I move the wires farther apart.
The switch appears to work the same regardless of which wire I put in which hole on the switch.
This is also the only switch that controls the lights in the kitchen (not the same lights illuminating me in the video).
Even though the light "works" now, I think I'm at the point where I should call an electrician as this has me concerned.