R1 + R2 expected readings

[cireland]

Previously I’d do dead and live testing and I’d be able to check check the r1 r2 results by the zs readings

Surely a bad connection is going to make BOTH readings off.
How does live testing confirm anything is ok?

 

[Lt1990]

For EICR purposes, the two things that come to mind are how close the calculated Zs is to the limit for the device, and a sense of how big the property you are in is and whether a reading seems plausible. The more you do the easier that gets.
e.g. if you're re in 2 up 2 down and you get 1.5 ohms for an immersion heater circuit then a bit of head scratching is due.

The other thing you can do is try RN+R2 or use a wander lead to obtain a 2nd frame of reference, and whether it's R1, R2 or both that have a loose connection.

I'm assuming that you are allowed to do Ze, Zs@DB and RCD tests, and your company only prohibits live Zs readings?

Yea I generat know what I’m looking at what seems high and things but I just wanted something to work towards incase I was been slightly generous and over cautious chasing faults that didn’t really need further investigation.

And yea so we do ze zsdb And rcd tests
It’s literally just only zs readings that we can’t do

 

[Lt1990]

This is so basic for someone qualified. Whether dead or live testing, you should know the methods of carrying them out (and working them out) without thinking.

I do know the methods for carrying them and things,
I was just asking to know so I knew if I was over cautious or to generous when it came to the readings

 

[Lt1990]

This is a 'modern' take on Zs testing that you don't do it live except for socket outlets where there is no risk of exposed live parts but as @timhoward asks do you carry out Ze and rcd tests.

Yea we carry out ze and rcd tests
It’s just the zs we don’t carry out

 

[Vortigern]

You are either going to be carrying Zs on lights or sockets principally. Spurs come into it as well. I always do live tests at sockets, spurs and lights. I use the lightmate by Kewtech for Zs test. On courses it has been put to me this is a Lim, as you have to go up a ladder and H&S forbid this in many scenarios. I just get on with the job and test it all. When I put the Zs reading for each circuit I like to be sure I did actually read it with my MFT, I can't imagine any other way to operate. Maybe I am missing something, but I don't think so. Convince me! I mean how do you fill in the forms? Yes calculation, but I am not convinced that is kosher. For instance you can find that there are big variances between R1/R2 + Ze calculation and Zs measured with an MFT.

 

[westward10]

Yea we carry out ze and rcd tests
It’s just the zs we don’t carry out

Have you ever asked why seems like someone has carried out a risk assessment and deemed it is not safe.

 

[westward10]

You are either going to be carrying Zs on lights or sockets principally. Spurs come into it as well. I always do live tests at sockets, spurs and lights. I use the lightmate by Kewtech for Zs test. On courses it has been put to me this is a Lim, as you have to go up a ladder and H&S forbid this in many scenarios. I just get on with the job and test it all. When I put the Zs reading for each circuit I like to be sure I did actually read it with my MFT, I can't imagine any other way to operate. Maybe I am missing something, but I don't think so. Convince me! I mean how do you fill in the forms? Yes calculation, but I am not convinced that is kosher. For instance you can find that there are big variances between R1/R2 + Ze calculation and Zs measured with an MFT.

@Lt1990 is only carrying out works in the way as suggested by his company.

 

[cireland]

The place I work also tells us we are NOT to work live.
Dunno how the hell we're supposed to complete EICRs.

 

[Lt1990]

Have you ever asked why seems like someone has carried out a risk assessment and deemed it is not safe.

Where I previously worked we carried out full tests but I’ve only recently started for this place and from what I can gather it’s literally just down to them not wanting us to work live.
They are health and safety mad

 

[Lt1990]

You are either going to be carrying Zs on lights or sockets principally. Spurs come into it as well. I always do live tests at sockets, spurs and lights. I use the lightmate by Kewtech for Zs test. On courses it has been put to me this is a Lim, as you have to go up a ladder and H&S forbid this in many scenarios. I just get on with the job and test it all. When I put the Zs reading for each circuit I like to be sure I did actually read it with my MFT, I can't imagine any other way to operate. Maybe I am missing something, but I don't think so. Convince me! I mean how do you fill in the forms? Yes calculation, but I am not convinced that is kosher. For instance you can find that there are big variances between R1/R2 + Ze calculation and Zs measured with an MFT.

I agree with you they is differences from calculations and actually measured results and I use to always do live tests at previous company
But I’m just following what this company requires us to do and that is calculations for zs results and not to do live testing apart from ze and rcd tests