Random RCD tripping
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From: a ) Subject: Random RCD tripping Would I be right in thinking the only culprits (appliance wise) are those that have an earth connection - so I can disregard all double insulated apps (which I think is most of them except kitchen apps)? well, the earthed ones are far more likely culprits, thought its not quite a 100% thing. Nearly though. Prime suspects are always things with water heating elemtns in: washing machine, dishwasher, kettle, oven as well, and the biggest cause of all is immersion heater. Alternatively, insulation test or pat test all appliances, including the fixed ones. Of course it'll cost you. Hmmm, last resort... Why not test everything with a multimeter first? No guarantee it'll pick out the duff appliance(s), but it usually will, and its cheap and easy. Check resistance on max R range between earth and (L&N connected together). Suspect the item(s) with the lowest insulation resistance reading. Note: make sure the switch on the appliance is on, and item set to boil, otherwise you'll only be testing a part of the appliance. Obviously I dont maen it should be plugged in during test :) NT |
Would I be right in thinking the only culprits (appliance wise) are
those that have an earth connection - so I can disregard all double insulated apps (which I think is most of them except kitchen apps)? well, the earthed ones are far more likely culprits, thought its not quite a 100% thing. Nearly though. Prime suspects are always things with water heating elemtns in: washing machine, dishwasher, kettle, oven as well, and the biggest cause of all is immersion heater. Well the immersion heater was removed a few months ago so thats not the problem (very scary when I looked at the connections on the element btw - how it had never burst into flames I'll never know!) Alternatively, insulation test or pat test all appliances, including the fixed ones. Of course it'll cost you. Hmmm, last resort... Why not test everything with a multimeter first? No guarantee it'll pick out the duff appliance(s), but it usually will, and its cheap and easy. Check resistance on max R range between earth and (L&N connected together). Suspect the item(s) with the lowest insulation resistance reading. Note: make sure the switch on the appliance is on, and item set to boil, otherwise you'll only be testing a part of the appliance. Obviously I dont maen it should be plugged in during test :) Worth a try I guess - wasnt sure how well a multimeter would work on this without sending high voltages around, but I'll get the Fluke out and see if anything turns up. cheers. |
a wrote:
Would I be right in thinking the only culprits (appliance wise) are those that have an earth connection - so I can disregard all double insulated apps (which I think is most of them except kitchen apps)? well, the earthed ones are far more likely culprits, thought its not quite a 100% thing. Nearly though. Prime suspects are always things with water heating elemtns in: washing machine, dishwasher, kettle, oven as well, and the biggest cause of all is immersion heater. Well the immersion heater was removed a few months ago so thats not the problem (very scary when I looked at the connections on the element btw - how it had never burst into flames I'll never know!) Alternatively, insulation test or pat test all appliances, including the fixed ones. Of course it'll cost you. Hmmm, last resort... Why not test everything with a multimeter first? No guarantee it'll pick out the duff appliance(s), but it usually will, and its cheap and easy. Check resistance on max R range between earth and (L&N connected together). Suspect the item(s) with the lowest insulation resistance reading. Note: make sure the switch on the appliance is on, and item set to boil, otherwise you'll only be testing a part of the appliance. Obviously I dont maen it should be plugged in during test :) Worth a try I guess - wasnt sure how well a multimeter would work on this without sending high voltages around, but I'll get the Fluke out and see if anything turns up. If you have a E/N short a meter will show it up allright. What it doesn;t show is insulatin faults that ac=rc only when HV applied. Try it. cheers. |
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