loop impedance on lighting circuit

[Ib≤In≤Iz]

You have to use 3 leads with the fluke, press F1 to select L - PE, there should also be dots inside N PE L.

Then test.

I have a 1652c, but should be the same on yours I would have thought.

 

[telectrix]

i thought so, but was unsure as the only use i've ever had for a fluke was a doorstop.

 

[jimmymack56]

yes got continuity on cpc,am testing between switched live with switch open.

 

[Pete999]

yes got continuity on cpc,am testing between switched live with switch open.

with the switch open or off you will have NO LIVE FEED

 

[frontier219]

How about going to the fitting and performing a 3 lead test there? That would be a more accurate measure of the circuits Zs too. Although I am unsure whether you are actually testing the circuit for any reason, or is it just to get a feel for your meter?

 

[jimmymack56]

yes,it is on,I am putting the earth lead on the cpc,and the live probe on the switch live,I will try it with all 3 probes,but I wouldn't be able to do that at a light switch would i? I would have to go to the rose,and on the video which is on you tube,by routledge textbooks they are doing it at the switch with 2 probes,which is the one i am trying to do,I am thinking the 1651 fluke isn't capable to test like that.

 

[Leesparkykent]

yes,it is on,I am putting the earth lead on the cpc,and the live probe on the switch live,I will try it with all 3 probes,but I wouldn't be able to do that at a light switch would i? I would have to go to the rose,and on the video which is on you tube,by routledge textbooks they are doing it at the switch with 2 probes,which is the one i am trying to do,I am thinking the 1651 fluke isn't capable to test like that.

I don't use a fluke but could possibly be that the tester requires you to use the 3 leads to confirm polarity.

 

[jimmymack56]

meant to say switch closed (on)

 

[frontier219]

Not used a fluke myself, but I think what a couple of people have suggested is to join the N-E probes before testing, rather than only using two, although this will depend on if the circuit is RCD protected.

 

[jimmymack56]

yes,I am trying to get used to the meter,maybe I am watching too many videos on you tube with different meters and expecting mine to do the same,a lot of those look (are) a lot newer than mine

 

[jimmymack56]

I wiil try that later and let you know if it works,thanks

 

[telectrix]

your videos probably show a megger 1700 series. these will do no trip loop tests with 2 leads. earlier megger swon't.

 

[davesparks]

Is there RCD protection on the circuit? If not then you should be using a 2wire high current loop test.
If there is an RCD on the circuit then you will have to use the alternative 3wire non-trip loop test.

 

[jimmymack56]

tried joining the E &N and it tripped the rcd,it works fine using the 3 at the rose but I don't think it can be used at the switch,at least i know now.Thanks for the help.Greatly appreciated.

 

[frontier219]

tried joining the E &N and it tripped the rcd,it works fine using the 3 at the rose but I don't think it can be used at the switch,at least i know now.Thanks for the help.Greatly appreciated.

Yeah, 2 lead no-trip tests are only available on newer models AFAIK. Can I ask what two leads you were using before hand? I think you may have been getting >2000 because you were using the 'L' and 'E' leads. If you are doing a two lead test (continuity etc.) on every tester I've ever used you have to use the 'L' and 'N' probes.

 

[brucelee]

Yes fluke requires 3 leads well the one I used on my 2391 did try at the pendent or fiting using 3 leads and think you use F3 to change settings also helps using instruction manual or watch you tube video with one thats using a fluke

 

[jimmymack56]

yes,i was using the L&E probes,I will try the L&N,I will get the hang of it
if it kills me

 

[jimmymack56]

Hi Frontier219,just tried that and it tripped the rcd,it is on its minimum setting too.If I pass the course i will invest in a later model.Thanks again.

 

[frontier219]

It will trip the RCD because your tester will nto do a 2 lead no-trip test. The point I'm making is, if you're doing continuity or IR, you will always need to use the L & N leads, no matter what you're testing.

 

[jimmymack56]

I see,thanks,I am new to testing ,been in the electrical game since i left the army 10yrs ago,and have been going to night school,would like to do a few jobs of my own but won't till i am 100% sure i know what i am doing.i have paid for an inspect and test course in june of this year,am reading Gn 3 and Osg night and day,and follow the tester at work round like a sheep,lol.I will get there eventually,i hope.