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What do you consider a sample to mean during an EICR

I’m interested to hear peoples opinions on how they approach an EICR with regards to a sample? I’m asking because I was recently reviewing a couple of domestic EICRs for a client and raised a couple of questions one being that test results were only recorded for two of the six circuits. The response was that they were employed only to carry out a 20% sample. Personally I’ve always considered a 20% sample to mean that all circuits should be tested but only at 20% of the accessories connected to them will be fully tested and inspected. I’ve also always thought when carrying out an EICR for the purposes of private lettings that this practice is only an option when the previous records are available, and if you do choose to carry out a small sample you’d be likely to widen the search if you found any C2’s or C1s. What is everyone’s thoughts here, how does the community approach EICRs?

I was just surprised to see an unsatisfactory report where the sample hadn’t been widened and where four circuits had no test results recorded, not even Insulation resistance, it’s so quick getting IR results on a single phase board.

Parents
  • Two or three centuries ago whilst at college I remember doing all sorts of equations for sampling and significance tests etc etc etc. I do remember it`s not often as you might first think and there are many considerations. and that`s with production runs so if you add into the mix random things like, for example, who did this wiring, who added to it, who added again etc etc then it becomes quite kerfuffled.

    More recently I was reminded of it when I saw an article about bayer`s theorum in relation to diseases and vaccines etc etc and again it reminded me of the stuff I once knew a bit about.

    So when I or anyone else think about sampling the we might be quite wrong or sometimes "just a bit right"

Reply
  • Two or three centuries ago whilst at college I remember doing all sorts of equations for sampling and significance tests etc etc etc. I do remember it`s not often as you might first think and there are many considerations. and that`s with production runs so if you add into the mix random things like, for example, who did this wiring, who added to it, who added again etc etc then it becomes quite kerfuffled.

    More recently I was reminded of it when I saw an article about bayer`s theorum in relation to diseases and vaccines etc etc and again it reminded me of the stuff I once knew a bit about.

    So when I or anyone else think about sampling the we might be quite wrong or sometimes "just a bit right"

Children
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