janclaes47 Posted August 20, 2018 Share Posted August 20, 2018 I have one of those infamous on/off's while I sit at my pc. PC restarts - fans stop - clocks everywhere reset etc. As it happens i hear a sound in the distance as if a breaker opens. The breaker box is 2 rooms away but doors are open all the time. So I get up to look at the breaker box, but nothing has opened. I recall that I hear such a sound usually in similar events. Rara, where the sound come from? Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 It could be an under-volt trip operating, can you post a photo of the breaker box and associated stuff please? Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 The breakers that are open are so on purpose, not because they went off. Link to comment Share on other sites More sharing options...
bankruatsteve Posted August 20, 2018 Share Posted August 20, 2018 Do you have a AVR (AVS)? Mine turns off/on with a more than subtle bang. Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 9 minutes ago, bankruatsteve said: Do you have a AVR (AVS)? Mine turns off/on with a more than subtle bang. What's AVR? Link to comment Share on other sites More sharing options...
bankruatsteve Posted August 20, 2018 Share Posted August 20, 2018 14 minutes ago, janclaes47 said: What's AVR? Automatic Voltage Regulator/Stabilizer Most folks will have to bring poor voltage (<200v) up to 220v. In my case, I have to bring down high voltage (>240v) to, well my unit bangs it to 218v. Only purpose is to keep electronic things from getting sick and/or dying. BTW: You have electric clocks? I really can't recall ever seeing that in Thailand. ? Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 1 hour ago, janclaes47 said: The breakers that are open are so on purpose, not because they went off. I see parts of other boxes near your breaker board, what's in them? Try to post a photo of the entire installation. Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 5 minutes ago, Crossy said: I see parts of other boxes near your breaker board, what's in them? Try to post a photo of the entire installation. The box you don't see is just an extension of the lower box. There are only some more MCB's inside, and the rails from both boxes are inter connected. Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 12 minutes ago, bankruatsteve said: Automatic Voltage Regulator/Stabilizer Most folks will have to bring poor voltage (<200v) up to 220v. In my case, I have to bring down high voltage (>240v) to, well my unit bangs it to 218v. Only purpose is to keep electronic things from getting sick and/or dying. BTW: You have electric clocks? I really can't recall ever seeing that in Thailand. ? I don't have AVR. My electric clocks are actually the clock on kitchen appliances etc. Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 2 minutes ago, janclaes47 said: The box you don't see is just an extension of the lower box. There are only some more MCB's inside, and the rails from both boxes are inter connected. If that's the case then your "on/off noise" is coming from elsewhere, another room perhaps? Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 1 minute ago, Crossy said: If that's the case then your "on/off noise" is coming from elsewhere, another room perhaps? Could be, but the only thing between is the kitchen. Do the surge protectors make a noise? Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 1 minute ago, janclaes47 said: Do the surge protectors make a noise? No. Is this installation in a house? Where is the incoming supply? Is there a main breaker you can turn off and listen for the noise when you do? Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 This is a house installation, and the main breaker is outside about 15 meters distance. If I turn off the main breaker there is obviously no electric, so it can't go on/off :-) The electric on/off is caused by the utility network that goes down for a single second, and the noise is only when that happens. All circuits are affected by the powercut, but some appliances respond faster than others. Link to comment Share on other sites More sharing options...
bankruatsteve Posted August 20, 2018 Share Posted August 20, 2018 1 minute ago, janclaes47 said: If I turn off the main breaker there is obviously no electric, so it can't go on/off ? Well, that was Crossy's point - to simulate a mains power out. But, if 15m away, you obviously won't be hearing much from there. Link to comment Share on other sites More sharing options...
janclaes47 Posted August 20, 2018 Author Share Posted August 20, 2018 1 minute ago, bankruatsteve said: Well, that was Crossy's point - to simulate a mains power out. But, if 15m away, you obviously won't be hearing much from there. Sorry went over my head, Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 You'll be needing an assistant to operate the main breaker (simulating a power cut) whilst you listen for the noise and isolate the source. Link to comment Share on other sites More sharing options...
rumak Posted August 20, 2018 Share Posted August 20, 2018 just a wild guess..... but sometimes there will be a quick ( one to two second) shut-off/ back on) at my property which i am pretty sure is caused by electric supplier doing a switch, or something. Right back on but tv, computor, microwave clock, etc all have to reset.. This only happens occasionally ( a few times in a week).....so if it happens a lot more than that than maybe something on your end Link to comment Share on other sites More sharing options...
lopburi3 Posted August 20, 2018 Share Posted August 20, 2018 Sounds like the normal bad switching of power (here in Bangkok most often on weekends and holidays) where no sync is performed so have microsecond to several seconds outage when new supply is connected. Seems to happen mostly when the "B" team is working. Indeed will reset most clocks and cause computer reboot or worse. A huge incentive to have a UPS. Link to comment Share on other sites More sharing options...
Crossy Posted August 20, 2018 Share Posted August 20, 2018 4 hours ago, lopburi3 said: Sounds like the normal bad switching of power Yes, but out OP is asking about a "sound" that occurs when these brief interruptions occur. Link to comment Share on other sites More sharing options...
lopburi3 Posted August 20, 2018 Share Posted August 20, 2018 Compressors pumping fluid rather than gas? Can be a very loud bang - and not exactly good for the units. Link to comment Share on other sites More sharing options...
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