Ewi
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Hey all.
Im new to this forum. Seeing how limited d web is to rectifying any electrical queiries, i thought i might find this useful.
I am a warranted electrical domestic licencee. (Based on IET) and possess a Higher Diploma in Electrical Engineering. I live in Malta (EU) which uses a UK electrical based infrastructure. (TT system).
Just yeaterday as i was looking into a fault at a client, i realised something very strange regarding current draw. I plugged a 0.9KW hairdryer (3.9A @ 230v) into wall socket outlet and clamped live and neutral seperately. L read 4.2A and N read 3.6A. Unless my clampmeter requires calibration what is the reason of this variation???
The worst part is that when i clamped the hot conductor at the consumer unit main DP MCB, it marked that it was drawing 9.2A!!! (Yes, I have deducted the current that was being drawn from the house at that time). That is more than double what it should be marking. I understand that the cables from socket outlet to consumer unit might carry some extra resistance hence draw more current, but surely not to that extent!!!
Can anyone explain this other discrepancy???
Im new to this forum. Seeing how limited d web is to rectifying any electrical queiries, i thought i might find this useful.
I am a warranted electrical domestic licencee. (Based on IET) and possess a Higher Diploma in Electrical Engineering. I live in Malta (EU) which uses a UK electrical based infrastructure. (TT system).
Just yeaterday as i was looking into a fault at a client, i realised something very strange regarding current draw. I plugged a 0.9KW hairdryer (3.9A @ 230v) into wall socket outlet and clamped live and neutral seperately. L read 4.2A and N read 3.6A. Unless my clampmeter requires calibration what is the reason of this variation???
The worst part is that when i clamped the hot conductor at the consumer unit main DP MCB, it marked that it was drawing 9.2A!!! (Yes, I have deducted the current that was being drawn from the house at that time). That is more than double what it should be marking. I understand that the cables from socket outlet to consumer unit might carry some extra resistance hence draw more current, but surely not to that extent!!!
Can anyone explain this other discrepancy???