Discuss R1+R2 continuity both ways in the UK Electrical Forum area at ElectriciansForums.net
Get the impression that there wasn't any testing before CU change hope I'm wrongI'm not brave enough,to ask what the readings were,before the board swap...
Thanks anthony. This is helpful. I did indeed have the cpc still connected to the bar. Hadn't realised this could introduce problems. I'll update this post at the end of the day with the results! Hopefully just that and an incorrect ir test...No damp areas? Almost like there is something else in the circuit? Or when you IR'd did you have cpc on the bar still with neutral connected?
Even worse pain is not IR testing and the RCDs trip and you have to start ripping your nice neat CU to bits to find the faultYeah can see the logic. Point taken. IR tests are such a pain though!
I understand that you are relatively new to the industry (you mentioned this earlier in the thread) Inspection & testing isn't just about taking readings and checking them against what is accepted. Its also about understanding what the tests are for, why the readings are what they are and the implications of such, whether acceptable or not.Thanks everyone. Lesson learnt. My error on both.
The cpc continuity is now fine. I'd left cpc in cu met bar. When I removed it the readings were fine.
again, my error with ir. Reading was as stated by others actually 0.7 m ohms. Looks like I've got an issue with the lighting insulation.
Methodical step by step testing the correct way I completely agree, but hadn't realised leaving cpc in met caused errors which lead me down the wrong path. Thanks.
It should be clear that this is the action to take for IR testing and that continuity testing should normally be undertaken with no possibility of parallel paths reducing the reading.It's less the leaving the CPC in the main earth bar and more to do with the neutral conductor being left connected. The correct prescribed method is to leave the cpc connected, but remove both live conductors.
It should be clear that this is the action to take for IR testing and that continuity testing should normally be undertaken with no possibility of parallel paths reducing the reading.
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