Discuss r1 r2 Jump Leads in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

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chrisgc

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Just wondered if anyone has made own leads?

If so type of cable used?
 
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MarkieSparkie

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  • #2
Most domestic applications covered by 4mm[SUP]2[/SUP] Earth Bonding Cable and large insulated crocodile clips. Pairs of cables made up in 200mm, 400mm and 800mm lengths in my kit. Each cable has a label attached stating it's resistance, measured on a milliohmmeter, so I can allow for the additional resistance where this is significant to it's application.
Larger CSA custom made jumper cables can be made up for specific commercial and industrial applications when required in a similar manner. I've always got a range of crocodile clips (small to large heavy duty) in my spare box, plus a range of earth cable sizes with me when required.
 
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I used an old robin fused test lead probe (500mA), joined to an unfused megger type lead, The old robin end is re-wireable just about so it is 1 lead about 4' long with no dodgy choc blocks!

Ideal for doing r1+r2's on the fly, and the fuse gives you a little protection in the evnt of your fuse finder lying!
 
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Adam W

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  • #6
I bought a pack of pre-made croc clip leads from Maplin a while ago, for about a fiver.
They're quite thin, but we were given them to use in the college workshop; I queried whether we needed to subtract the resistance of the clip lead from the total and was told it would be negligible because it was only a short lead (about 40cm).
That suits me because the leads were cheap, and it saves a bit of calculating.
 

HandySparks

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If you want an accurate result and you're using a particular jump lead, zero your tester with the jump lead connected across the tester probes or clips. Then its resistance is automatically accounted for along with the tester leads.
 
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Geordie Spark

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  • #8
I bought a pack of pre-made croc clip leads from Maplin a while ago, for about a fiver.
They're quite thin, but we were given them to use in the college workshop; I queried whether we needed to subtract the resistance of the clip lead from the total and was told it would be negligible because it was only a short lead (about 40cm).
That suits me because the leads were cheap, and it saves a bit of calculating.
I have a set of these too ..... much cheaper than Kewtech etc. & do the same job.
 
I bought this type from marplins a few months ago, their excellent and come in varying lengths. They are in fact negligible resistance due to their short length, although as has been said its easy to include them when nulling the test leads
 
O

oldtimer

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  • #10
Yep great minds think alike I bought Maplins crocs set and made a jump lead from an old damaged fluke lead I use it a lot to do a globel IR test on a CU when testing for a replacement
 

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