No voltage in the outlet - what to do?
The difficulty is that the outlet voltage is about 50 V, the indicator does not respond to voltage. The house is old, the switchgear is made but the rules, albeit to the old leash, did not find the distribution box (possibly reliably plastered), in the rest the socket is all normal. Tell me where to look?
The problem is that if all the outlets are working properly, then here, apparently, a bad contact somewhere on the line or the wire was interrupted. Therefore, you need to start to find distribution boxes. Well, or look for a person with a device to search for hidden wiring and look for how the line goes for this outlet.