Two test leads, one port

[Haworth]

Hoping someone might be able to help. I’ve seen an ‘adaptor’ that allows 2 test leads to run from one port of an MFT (doing IR test). But, can’t find anywhere to buy it. Anyone know where I could get one from?

 

[James]

Erm, why would you wat to do that is the obvious question.

The idea of ir testing is to show the resistance between 2 items, if you add a 3rd in to the equation then you have the possibility of joining 2 things that are at different potential and destroying a set of leads amongst the other risks.

 

[Pete999]

Hoping someone might be able to help. I’ve seen an ‘adaptor’ that allows 2 test leads to run from one port of an MFT (doing IR test). But, can’t find anywhere to buy it. Anyone know where I could get one from?

The makers of the MFT?

 

[Haworth]

Erm, why would you wat to do that is the obvious question.

The idea of ir testing is to show the resistance between 2 items, if you add a 3rd in to the equation then you have the possibility of joining 2 things that are at different potential and destroying a set of leads amongst the other risks.

Surely, you understand that let’s say you link L&N together and test with earth, as you’re passing 500v down both L&N then the potential difference is zero. So, no you would not destroy the leads.

 

[Haworth]

The makers of the MFT?

That’s what I thought but sadly not. Just thought there might be a ‘universal’ one out there. If not, it’s not the end of the world.

 

[evorg88]

The kewtech test leads allow this. The green test lead has two ports allowing you to piggy back off it. Just found some on amazon but I can’t post the link as it says I’m spamming...

 

[Baddegg]

Hoping someone might be able to help. I’ve seen an ‘adaptor’ that allows 2 test leads to run from one port of an MFT (doing IR test). But, can’t find anywhere to buy it. Anyone know where I could get one from?

IR test is 2 lead test anyways.....can’t see how joining em is gonna achieve anything ?? Kewtech do a piggy back lead for joining neutral and earth when performing Ze high current loop test....is that what you are referring to?

 

[Haworth]

The kewtech test leads allow this. The green test lead has two ports allowing you to piggy back off it. Just found some on amazon but I can’t post the link as it says I’m spamming...

Roger that evorg88. Think I’ve found them on eBay to.

 

[Haworth]

IR test is 2 lead test anyways.....can’t see how joining em is gonna achieve anything ?? Kewtech do a piggy back lead for joining neutral and earth when performing Ze high current loop test....is that what you are referring to?

I get that it’s a two lead test. But watching a GSH video where they do IR test, rather than using croc clip to L&N they had this funky looking piggyback lead.

 

[DPG]

Can you clarify what you are trying to achieve by joining the 2 leads to perform an IR test.

 

[Haworth]

Can you clarify what you are trying to achieve by joining the 2 leads to perform an IR test.

It’s just rather that clipping L&N together when doing test where there might be unknown loads.

 

[Baddegg]

I get that it’s a two lead test. But watching a GSH video where they do IR test, rather than using croc clip to L&N they had this funky looking piggyback lead.

So still using 2 test leads?.....just a way of joining the cable cores together rather than crocing them?

 

[Baddegg]

Please post a pic if you find it...

 

[Deleted member 105166]

So still using 2 test leads?.....just a way of joining the cable cores together rather than crocing them?

What's the point though, as opposed to croc-ing L+N in a single clip?

 

[DPG]

I think I'm missing something here.

 

[Baddegg]

What's the point though, as opposed to croc-ing L+N in a single clip?

I’m with you Tony.....just trying to build a picture of what @Haworth is talking about

 

[Haworth]

What's the point though, as opposed to croc-ing L+N in a single clip?

Non really, just wanted to know if you could buy these things.

 

[davesparks]

Kewtech do a pack of 4 shorting links with a Croc clip at both ends, this is what I use for this sort of thing.

 

[davesparks]

What's the point though, as opposed to croc-ing L+N in a single clip?

Quite often in a DB the live and neutral terminals can be quite far from each other and its less messy to add a test link between the two than drag one conductor out of a big bunch of cables.

 

[HRM-ELEC]

 

[HRM-ELEC]

Sure be has them on this vid

 

[static zap]

L-to-N is that a louder bang test ?
(instinctive muscle memory -scares me at times)

 

[oracle]

Do you mean like this?

 

[HappyHippyDad]

I'm a little confused by this thread to.
For an IR test where you are joining L and N, you are joining the L and N of the outgoing conductors not the test leads.

 

[Lucien Nunes]

I can't understand why everyone is so confused. Sometimes you want to do some test or another from A + B to C. For an IR test that might be L+N to E, or L1 + L2 + L3 to E or whatever, which if you have stackable test leads, you can achieve by putting one clip on each conductor and stacking / piggybacking the leads if they are stackable. It reduces the number of things that might come apart or ping off during the test, vs jumpering with separate croc clip leads. In electronics lab work, joining, branching and daisy-chaining test leads is normal so most bench test leads have a piggyback socket.

I keep a set of touchproof stackable leads and probes in the testing kit to make up whatever configuration is required. They are only for dead tests though as they are not CAT III rated.

 

[DPG]

Ah, Lucien's post has helped. The wording of the question made me think the OP was trying to do some sort of different test by using both ports of the MFT.

 

[Baddegg]

That’s cleared that up then.....thanks @Lucien Nunes

 

[HappyHippyDad]

I can't understand why everyone is so confused. Sometimes you want to do some test or another from A + B to C. For an IR test that might be L+N to E, or L1 + L2 + L3 to E or whatever, which if you have stackable test leads, you can achieve by putting one clip on each conductor and stacking / piggybacking the leads if they are stackable. It reduces the number of things that might come apart or ping off during the test, vs jumpering with separate croc clip leads. In electronics lab work, joining, branching and daisy-chaining test leads is normal so most bench test leads have a piggyback socket.

I keep a set of touchproof stackable leads and probes in the testing kit to make up whatever configuration is required. They are only for dead tests though as they are not CAT III rated.

Oh yeah, that's a good idea

 

[Cid]

It's called a piggyback adapter. Close thread.

 

[Bellendian]

I was always under the impression that if you individually test L to E, and N to E, without joining them together, you basically do the same test, just without the hassle of having to use piggyback leads or disconnect stuff?

 

[Cid]

No. The purpose is to keep both L and N at the same potential

 

[Lucien Nunes]

But if there are hidden loads on an existing circuit being tested for an EICR, not joining L & N together could inadvertently apply 500V across the load and cause damage. Best to test both to earth at once if unsure.