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Do-It-Yourself (DIY) Question & Answer Forum
Help needed in trying to diagnose a fault please
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<blockquote data-quote="Doc Hudson" data-source="post: 461538" data-attributes="member: 1607"><p>It may help your understanding if you keep in mind a few key principals: Electricity always generates heat whilst travelling through a circuit. greater current, (greater power / bigger loads), will generate greater heat. Electricity can bridge or jump a gap where live parts are exposed or have damaged insulation. Bigger currents can jump bigger gaps (that's basically what thunder &amp; lighting are). Damp and moisture in contact with damaged insulation can create an easier path for electricity to bridge between conductors causing high fault currents and rapid rise in temperature in the circuit before the fuse(s) trip.</p><p></p><p>Continuity and insulation resistance tests on your underground cable will probably take less than 30 mins. It would identify if the cable is seriously defective and should be disconnected immediately, Or if it has signs of ageing but still has a bit of life left in it, Or if it tests out all safe and functional and should be good for many years. Even at a standard 1 hour call out charge I guess this would only be £30 +/- £5. and would leave you much wiser about the condition of the underground supply.</p><p></p><p>Doc H. </p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 461538, member: 1607"] It may help your understanding if you keep in mind a few key principals: Electricity always generates heat whilst travelling through a circuit. greater current, (greater power / bigger loads), will generate greater heat. Electricity can bridge or jump a gap where live parts are exposed or have damaged insulation. Bigger currents can jump bigger gaps (that's basically what thunder & lighting are). Damp and moisture in contact with damaged insulation can create an easier path for electricity to bridge between conductors causing high fault currents and rapid rise in temperature in the circuit before the fuse(s) trip. Continuity and insulation resistance tests on your underground cable will probably take less than 30 mins. It would identify if the cable is seriously defective and should be disconnected immediately, Or if it has signs of ageing but still has a bit of life left in it, Or if it tests out all safe and functional and should be good for many years. Even at a standard 1 hour call out charge I guess this would only be £30 +/- £5. and would leave you much wiser about the condition of the underground supply. Doc H. [/QUOTE]
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Help needed in trying to diagnose a fault please
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