regedit Posted August 14, 2019 Share Posted August 14, 2019 I’ve disconnected the load (supply to RCD for shower) from the RCBO but as soon as I supply power by switching on the Main Circuit Breaker the RCBO trips. How to troubleshoot ? Has the RCBO died ? Link to comment Share on other sites More sharing options...
Crossy Posted August 14, 2019 Share Posted August 14, 2019 Start by disconnecting both wires (L and N) at the output side of the RCBO, if it still trips it's almost certainly busted. Link to comment Share on other sites More sharing options...
bankruatsteve Posted August 14, 2019 Share Posted August 14, 2019 Is this something that just started happening after working good for some time previously? Anything changed coinciding with the tripping? Link to comment Share on other sites More sharing options...
regedit Posted August 14, 2019 Author Share Posted August 14, 2019 44 minutes ago, Crossy said: Start by disconnecting both wires (L and N) at the output side of the RCBO, if it still trips it's almost certainly busted. Yes that’s what I meant by no load. Don’t know how long its been happening - its on a second shower that only gets used when we visit the family. Link to comment Share on other sites More sharing options...
Crossy Posted August 14, 2019 Share Posted August 14, 2019 Check the "Test" button is not stuck, but I think it's time for a replacement. Link to comment Share on other sites More sharing options...
tjo o tjim Posted August 14, 2019 Share Posted August 14, 2019 If you have a sensitive clamp-on ammeter then clamp around the neutral and hot. Barring that or just replacing it, check voltage to ground on the neutral and hot at the heater. Reversed leads will often cause a trip. Link to comment Share on other sites More sharing options...
Crossy Posted August 14, 2019 Share Posted August 14, 2019 3 minutes ago, tjo o tjim said: If you have a sensitive clamp-on ammeter then clamp around the neutral and hot. Barring that or just replacing it, check voltage to ground on the neutral and hot at the heater. Reversed leads will often cause a trip. Whilst this is generally good advice our OP has removed the outgoing cables from the RCBO (post #4) and it is still tripping. Link to comment Share on other sites More sharing options...
Crossy Posted August 15, 2019 Share Posted August 15, 2019 A trolling post (and replies) has been removed. Link to comment Share on other sites More sharing options...
Snackbar Posted August 15, 2019 Share Posted August 15, 2019 It is a process of elimination. Last resort is to replace the breaker, NOT the first, due to the replacement cost. Link to comment Share on other sites More sharing options...
DUNROAMIN Posted August 15, 2019 Share Posted August 15, 2019 There are many reasons here for tripping. Too much load (amps) from the shower. Earth/water leakage from shower unit. Internal electrical/fault with Shower. Faulty RCBO, unlikely if not that old, Gecko has shorted a circuit board. The wiring in the roof is touching steel or other wiring. Thais tend to twist wires together and tape them, however, in my experiences in some cases I have seen where the sharp end of the wire becomes exposed and then has the capability of shorting out against steel or in my case a worker installing a tv cable got a shock on his foot, luckily my RCBO trigger with no major shock. Poor wiring (common in Thailand) Due to the back yard electricians here who have no formal training in load capacities and ratings of appliances, they tend to just wire up everything on two or three lines, and install over rated amp breakers, so you could find your shower line is on a circuit already overloaded, so if you turn on another appliance your RCBO will trip. As stated before a matter of elimination. Good luck Link to comment Share on other sites More sharing options...
bankruatsteve Posted August 15, 2019 Share Posted August 15, 2019 20 minutes ago, DUNROAMIN said: There are many reasons here for tripping. Please try to understand that MCB, RCBO, RCD, etc. should only trip when there is a fault in the wires connected. When nothing is connected, the device should not trip. When the device trips with nothing connected except mains (which is the case here), the device is most likely defective and should be replaced. There is nothing to eliminate when the device is the one and only factor. Link to comment Share on other sites More sharing options...
regedit Posted August 18, 2019 Author Share Posted August 18, 2019 Thanks - that’s what I understood so disconnected load as a first step. Will look at replacing RCBO. Link to comment Share on other sites More sharing options...
Snackbar Posted August 18, 2019 Share Posted August 18, 2019 If there is an earth leakage fault, buying and then replacing the residual current device will solve nothing and remove B1500.00 from ya funds. You’ll be back to square one. Find the fault and rectify it. Link to comment Share on other sites More sharing options...
Crossy Posted August 18, 2019 Share Posted August 18, 2019 @Snackbar please explain (you can use technical terms and drawings if you wish) how an RCBO/RCD with nothing (nada, zip) connected to its output terminals can be sensing an earth leakage fault. Our OP has stated several times that the device trips when power is applied even with all wires removed from the output side. Link to comment Share on other sites More sharing options...
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