How to find where the short circuit occurs?
He knocks out an automatic machine that stands on a wall outlet. Sometimes it knocks out right away, and sometimes after some period of time. He took off all the sockets, checked what does not change anyway, he also knocks it out. Unsoldering boxes can not be found, they are sealed somewhere in the walls. When measuring for a short circuit, the multimeter shows 450 Ohms, and then quickly the resistance grows to infinity. Sockets for these measurements are removed, the wires are wired.
Question: how to find where the closure occurs and how to eliminate this cause?
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Hello! Firstly, a multimeter cannot precisely measure such things. Secondly, this is normal, because a multimeter can lie, and an increase in resistance indicates a certain capacity between the cable cores, this is natural. Thirdly, why are you sure that this circuit? As I understand it, it knocks out only when connected to this load line, right? Then I would first check the broach of his contacts and how tightly the wires of wires sit in them. Further, if this did not help, I would try to replace the machine with a new one, maybe your failed? Well, the last, if the machine knocks out when the load is turned on (immediately or after a while), maybe the matter is in the connected load itself?
I also recommend studying the article: https://our.electricianexp.com/en/kak-najti-korotkoe-zamykanie-v-provodke.html