Discuss help with finding zs with rcd in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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marty1234

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hi can anyone help me with zs
when testing zs using my metrel eurotest meter with a rcd . i canot get a correct reading . i have tryed the meter on diffrent settings but still cannot get it right. i have to get zs by caculation .when doing the test the rcd will trip out
 
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S

sparkyork

hi, if your getting the results by calculation then all you need is a low ohm meter for R1 + R2 then do a loop test on your mains? i think?

when you say cant get a correct reading do you mean its tripping the rcd?

ps..glad i bought a fluke!!

you could always get some insulated leads with croc clips or summat and link out the rcd for the test?? used to do this a while back before getting a descent tester.
 
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sparky1ste

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  • #3
what readings are you getting? is it a tt system
 
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marty1234

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  • #4
my meter just trips out even if i set it to 10ma on a 30ma rcd

tnc-s system
 
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sparkyork

could it be that the rcd is shagged aswell then??? if not id just link the rcd out and do it that way.
 
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PAUL M

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  • #6
hi can anyone help me with zs
when testing zs using my metrel eurotest meter with a rcd . i canot get a correct reading . i have tryed the meter on diffrent settings but still cannot get it right. i have to get zs by caculation .when doing the test the rcd will trip out
:)i have got a metrel installtest ,have you tried setting it to no trip.;)
 
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marty1234

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  • #7
yes paul

what do you set youre meter to when testing zs on a main board with rcd on it my meter is the same on you have
 
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PAUL M

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  • #8
i set it to no trip and it gives me the zs but it takes a while and the reading is allways slightly higher than the calculation method.
 
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marty1234

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  • #9
thanks paul i set the meter to non trip to but the readings are a way out are you putting the meter on loop then on to rs(rcd10ma) to do the test
 
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Carter

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  • #10
hi can anyone help me with zs
when testing zs using my metrel eurotest meter with a rcd . i canot get a correct reading . i have tryed the meter on diffrent settings but still cannot get it right. i have to get zs by caculation .when doing the test the rcd will trip out
Just bought one of these (MI3100 Eurotest Easi) a few weeks back and have been checking it in the same RCD protected socket on our kitchen ring. With the 'trip-lock' selected it's been throwing up readings over 5 or 6 tests between 0.49ohms to 0.54 when I've just tried it again now. Seems to work a treat
same with the ramp test, consistent within +/- a few tenths of a mS. Can't ask more than that. My opinion will change markedly the first time it starts to play up but no trouble so far.

Chews through its battery pack though.
 
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PAUL M

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  • #11
no .on my meter i set it to no trip which is next to the l-n loop and l-e loop buttons,if im testing a 30mA rcd i set it to 30mA ,it is allways going to be slightly less accurate because it uses less current to do the test in order not to trip the rcd.
 
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marty1234

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  • #12
hi carter can you tell me what you what you are setting youre meter to to find zs on a rcd

i am putting my meter to loop
rcd 10ma
 
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