high r1+r2 and low IR

[Revved Up Sparky]

If the cpc is 1.0mm (rather than 1.5mm) then the expected r2 will be 0.18x2.5 = 0.45 ohms which is'nt far off 0.52.

As ProDave said, the socket in question could be faulty. The spring tension can deteriorate over time so that pins of the plugs do not make so good a contact with the socket.

 

[steptoe]

If the cpc is 1.0mm (rather than 1.5mm) then the expected r2 will be 0.18x2.5 = 0.45 ohms which is'nt far off 0.52.As ProDave said, the socket in question could be faulty. The spring tension can deteriorate over time so that pins of the plugs do not make so good a contact with the socket.

#16

I thank you, :Salute

 

[kme]

And make sure you un plug every thing even if it take you for ever, and ever to find every thing

Better to get the customer to do it, for two reasons:

1. They are more likely to know where stuff is.

2. If they miss summat, and you do a 500V test L-N and blow it up, it isn`t your fault

 

[jat01]

Went there on Thursday and pulled up the boards in the living room where the socket with high readings was.

Found a junction box feeding a hidden socket next to a fire place that was feeding a 1.5 twin and earth to another socket hidden behind a build in book case that was feeding yet another surface mounted socket.

Well done remedial work and the max r1 r2 reading is 0.21 ohms and highest Zs is 0.52 ohms, although IR reading are LN 2.0 meg ohms, LE 2.0 meg ohms and NE was 1.44 meg ohms, but they are over 1 meg ohm as stated in the OSG amd 1.

 

[NozSpark]

Got to say that those are rubbish IR results,,,,, and the regs say that while 1Mohms is a pass that anything under 2Mohms should be investigated:O

You still have problems mate!

 

[SPECIAL LOCATION]

Wot he said....

Needs more investigation IMHO...

personally I am not very happy with ANY IR readings in the single digit range..

I know of some really old installations with IR's greater then 10megohm

so has to be pretty naff to get into single digits...

Are you sure there is nothing left connected???

 

[steptoe]

I deffo wouldnt be happy, still all a C3 for me,

and in all honesty, no-one, and I mean no-one should be happy leaving an install with an IR like that.

even my horse would be pi55ed with me if I left that.

 

[Steve3948]

Yeah I would not be happy with those readings either, but how hung up on numbers are we.

If the meter range was 0-2mohms we would think it was fine, but because we now have testing equipment giving lots of digits we question it.

There was a time when over 0.5mohms was considered fine.

What is the real difference between 2mohms and Infinity, it seems massive but in truth it's not and that's why they set the acceptable level at 2mohms.

It sounds like something is still connected as stated above, but again as stated above C3 technically, or tell the customer you are not happy with the results still as they may get worse over time and you would like to investigate further unless they are happy to leave at that for the time being.

With what you found the installation sounds like a right mess anyway.