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Unfortunately, fault finding is down to experience. You can't learn it from any other source. at first, it takes ages to trace a fault. then the next time, you have learnt from the previous job, so it takes less time. eventually, you will have diagnosed the fault before you get to site.
 
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all i can really say about fault finding, is that its reverse engineering of installation. basicalls start from the simple and go from there. if it means drawing diagrams and scribbling over it, then do it. i always start by asking anybody about symptoms. what happened, when did it happen, what else happebned at the same time, and why do you think this happened, what do you tghink the problem is. quite often the operators of the equipment your trying to fix, may of noticed it deteriorating over time, or some blike damaged it ect.
 
and it all depends on how hard you hit it with the pat tester. the older seaward ones are best for this. right meaty buggers.
 
Unfortunately, fault finding is down to experience. You can't learn it from any other source. at first, it takes ages to trace a fault. then the next time, you have learnt from the previous job, so it takes less time. eventually, you will have diagnosed the fault before you get to site.
I agree 100%. Fault finding used to frighten me, now I look forward to it. Much better than chasing out walls.
 
it only really becomes a problem when your on a tight schedule if you got the time then relax and work it out , you wont get flustered and get more confused and next time the same fault crops up you will have a better idea.

I found when testing ring mains always splitting them makes life much easier to trace the fault. identify which sockets are on which leg then which leg has the fault (tend to just link l-e nowadays but at the start it was much easier using the first method.
 

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