Discuss R1+R2 of zero zilch nothing?...... in the UK Electrical Forum area at ElectriciansForums.net
Are you doing the testing correctly?Testing R1/R2 on 10mm/4mm T&E cable and the reading is 0.00? Never had this before, can I record 0 on the cert?
Thinks so,R1-R2 joined at board, disconnected at appliance, leads nulled, switch closed,croc on R1 croc on R2 test? Got Ze of 0.18 on tncs previous...Are you doing the testing correctly?
Never thought of doing that,thanks grant,using kewtech kt63 if that helps never had any issues before with it...Could be to low for your tester. Test it with out the leads nulled then deduct the test lead resistance off afterwards
What scale have you set on your MFT?Thinks so,R1-R2 joined at board, disconnected at appliance, leads nulled, switch closed,croc on R1 croc on R2 test? Got Ze of 0.18 on tncs previous...
Exactly what I was going to askWhat scale have you set on your MFT?
Never thought of doing that,thanks grant,using kewtech kt63 if that helps never had any issues before with it...
Fair comment fella, some testers have different scales, and if your on the wrong one a zero showing isn't unusual hence mine and Petes question.Sorry Pete and mdj,on my testers you just select continuity if there is a scale selection I’m not aware of it?...
So you have no LOW resistance scale on your MFT?Sorry Pete and mdj,on my testers you just select continuity if there is a scale selection I’m not aware of it?...
Fair comment fella, some testers have different scales, and if your on the wrong one a zero showing isn't unusaul hence mine and Petes question.Sorry Pete and mdj,on my testers you just select continuity if there is a scale selection I’m not aware of it?...
Show offResistance of copper per metre(mohms/M) appendix I of OSG:
10mm=1.83
4mm=4.61
1.83+4.61=6.44
6.44*8=51.52
51.52/1000=0.05 ohms.
So you have no LOW resistance scale on your MFT?Sorry Pete and mdj,on my testers you just select continuity if there is a scale selection I’m not aware of it?...
What scale have you set on your MFT?
Fair comment fella, some testers have different scales, and if your on the wrong one a zero showing isn't unusual hence mine and Petes question.
Thanks strima, that calculation with Archie’s advice would account for the zero reading,Resistance of copper per metre(mohms/M) appendix I of OSG:
10mm=1.83
4mm=4.61
1.83+4.61=6.44
6.44*8=51.52
51.52/1000=0.05 ohms.
Thanks to all who replied as always loads of good advice,
Save cable buy a check box /cardThanks strima, that calculation with Archie’s advice would account for the zero reading,
I am going to run some test tests tomorrow to put my mind at ease that the testers are working correctly, I’ll cut cable to exact lengths and then compare to osg/byb
What scale is this Pete? my MFT only has the low ohms continuity you select as the same as the Kewtech KT63, not sure about the individual continuity/insulation resistance testers.What scale have you set on your MFT?
I always appreciate the advice I’m given on here,You couldn’t buy the wealth of knowledge available, but.....I’m far from a spark!......yetGood man ............... no arsey responses , and feedback too
Seriously, this is how the forum should be - competent sparks, helping sparks
And if you do cut lengths, don't do them too short ...........
Don’t bother with exact lengths as resistance will change due to temperature variances.Thanks strima, that calculation with Archie’s advice would account for the zero reading,
I am going to run some test tests tomorrow to put my mind at ease that the testers are working correctly, I’ll cut cable to exact lengths and then compare to osg/byb
I will be looking into that shortly Pete thanksSave cable buy a check box /card
It’s not often I get to show off...Show off
I was thinking the OP may have had his MFT on the wrong setting, ie IR or something else continuity is OKWhat scale is this Pete? my MFT only has the low ohms continuity you select as the same as the Kewtech KT63, not sure about the individual continuity/insulation resistance testers.
The point that I was trying to make is that you get a circuit very close to the distribution equipment value is too small.If it is 2m away it cannot possibly be 0.01 ohm.
If it is 2m away it cannot possibly be 0.01 ohm.
Yes that’s what I was told just never actually got zero before..I was always taught not record a 'measurement' of zero, mark it up as 0.01.
Really??So you have no LOW resistance scale on your MFT?
Yes really mine did when I last saw itReally??
What year was that then?Yes really mine did when I last saw it
My wander lead is around 1.5 ohms, shall I chop 30m off to get the reading down?could always test with your wander lead, the resistance of which you should know ( typically 0.3 - 0.5 ohms), then deduct similar to previous suggestions.
Reply to R1+R2 of zero zilch nothing?...... in the UK Electrical Forum area at ElectriciansForums.net
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