From: robin_listas@es.invalid   
      
   On 2023-08-11 16:51, Brian Gregory wrote:   
   > On 08/08/2023 22:42, Carlos E.R. wrote:   
   >> On 2023-08-08 16:45, Jeroni Paul wrote:   
   >>> Carlos E.R. wrote:   
   >>>> Same problem as if I am in the bath, somebody else in the kitchen, the   
   >>>> RCD triggers, the other person resets it manually and immediately. It   
   >>>> will not hold.   
   >>>   
   >>> Bad idea. Water pipes and water heaters are earthed together with the   
   >>> rest of appliances,   
   >>   
   >> Not here, no.   
   >>   
   >>> if any has a short to ground it will be dumping the full mains   
   >>> voltage to the water pipes. If all is well this will trip the   
   >>> protector fast enough to save your life assuming you was taking a   
   >>> bath. Think about it, you really want to keep trying to see if it   
   >>> keeps saving your life again and again?? Don't forget the protector   
   >>> could eventually fail as well.   
   >>>   
   >>> Also keep in mind that when "it will not hold", it is connecting the   
   >>> power back for some milliseconds. It has no other way to detect a   
   >>> leak than to apply power and check. I would not keep trying if   
   >>> someone is in the bath.   
   >>>   
   >>>> This is certainly bad wiring, but I fail to see why it would make the   
   >>>> RCD trigger every day at 6:30, when there was a voltage surge from the   
   >>>> transformer station. The electrician that found the problem was   
   >>>> baffled.   
   >>>   
   >>> My theory is that asymmetric wiring will behave like an antenna, a   
   >>> magnetic pulse for example from lighting, strong interference or   
   >>> heavy machinery nearby will induce a current in one wire different   
   >>> than the other. Also the opposite, all transients and spikes coming   
   >>> from mains will be radiated more from one wire than the other   
   >>> resulting in an imbalance. Not to mention different stray capacitance   
   >>> and inductance caracteristics from the different wiring paths   
   >>> affecting the response to fast transients.   
   >>   
   >   
   > When a 30mA RCD is prone to false triggering it can mean you are trying   
   > to feed to much stuff from it. Some leakage is normal for many devices.   
      
      
   Well, it is mandatory in Spain to have at least one RCD covering the   
   entire house, so that's the normal: one RCD at the house entry,   
   protecting all. Some houses may have two or more, if they are really big.   
      
   But the total maximum of the house was 5 or 6 KW at the time, and normal   
   usage was much lower. Fridge, hot water tank (1KW), washing up machine   
   (2KW), and a water pump (0.7 KW). TV and lights.   
      
      
   > Here we usually use several 30mA RCDs, maybe one for upstairs sockets,   
   > one for downstairs sockets, one for lighting or something similar, but   
   > making sure everything is still protected.   
   >   
      
   --   
   Cheers, Carlos.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)