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Good afternoon

Was just wondering when a sample size is set for an EICR Say 50% would the remaining circuits have to be identified for schedule purposes. I'm training to becoming an electrician and it's something that I'm unsure about.

Thanks
Harry
 
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  • #3
Sampling is carried out on each circuit, not to the installation.
So you mean you would just test the ones you've allowed for in your sample size (say half the circuits in a dB) then you wouldnt mention the remaining ones in your report/charts
 
Bit of confusion here I think Harry is asking if you only test and inspect a percentage of the total circuits which is sometimes asked of by the client do you include untested circuits on the schedules.
 

ChrisElectrical88

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If what westward has said is correct then i label as Circuit Not Tested. I dont detail anything. I do however visuakky inspect the circuit to ensure nothing is obviously dangerous and check cable sizes to OCPDs etc.
 
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No.
If you decide your sampling rate is 50% then you inspect 50% of all accessories for each circuit..
Gs3 and all of my relevant books show you can set a sample size of no less than 25% for final circuit distribution boards so you wouldn't have topercentage of the circuits thoughye
Bit of confusion here I think Harry is asking if you only test and inspect a percentage of the total circuits which is sometimes asked of by the client do you include untested circuits on the schedules.
Yes this is what I meant. So do you have to include details e.g cables sizes etc for untested circuits and the number of points and what the circuit does.

I ask this because if you only allowed for a certain sample size, identifying circuits can't often take longer than the testing itself.
Thanks for the reply
 

Ian1981

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Sampling is something that is to be discussed with the client prior to the inspection, the more problems/faults found then you should discuss with the client about increasing the original sampling sizes.

I myself am inspecting a factory where it has been agreed to sample/ inspect and test 50% of all DB circuits this year (32 DB’s in total) then the other 50% on a yearly rollout basis on a continuous cycle Which will then eventually cover all the circuits.
 
If we are doing a percentage test we only write down the details for circuits tested and then write "circuit not tested" for the remaining circuits.
 
D

Deleted member 9648

It is VERY important to clearly state sample size on the cert, both in circuits tested and points removed for inspection. I have noticed unrealistic expectations of EICR's which has not been helped by comments from respected members on here who have continually advised EICR's as a total installation health check. It is not. A 50% sample rate of points removed for inspection would be extremely time consuming and disruptive on all but small installations. 25% is more realistic, and that means 75% wont be removed for inspection......and if that dangerous defect is not in the 25% removed.....you know the rest.
 
Am I right in thinking that before a client opts for a % of testing eg 33% each year over 3 years , they should have a full 100test carried out ?? Therefore year 1 is 100% then after that they can do 33% a year and spread the budget rather than doing 100% every 3 years ??

Also the OP slasked about filling in details for CNT ( circuit not tested) surely there is no details put in the full thing is left blank?
Thirdly when carrying out % testing what system do use use to identify what has been tested ( obviously you can see from reports) but does any one put say coloured dots on each year different colours each year ?
 
Was just wondering when a sample size is set for an EICR Say 50% would the remaining circuits have to be identified for schedule purposes. I'm training to becoming an electrician and it's something that I'm unsure about.
Sample size is generally referred to the number of points inspected during the EICR (ie 50% = 5No lights inspected on a circuit consisting 10No lights!), not a percentage of the number of circuits in an installation.
An EICR could be carried out on one circuit, all circuits or a percentage of circuits in an installation.
If as mentioned on previous posts you are asked to do an EICR on one or 33% of all circuits, You state which circuits on the report (with full schedule details) but still carry out a 100% inspection of those circuits and (for example) a 50% sample rate within those circuits.
Within those 33% of circuits there may be limitations etc. whereby circuits cant be inspected/tested and these are then labelled 'Circuit Not Tested' on the report with the other 66% of circuits.
 
Am I right in thinking that before a client opts for a % of testing eg 33% each year over 3 years , they should have a full 100test carried out ?? Therefore year 1 is 100% then after that they can do 33% a year and spread the budget rather than doing 100% every 3 years ??

Also the OP slasked about filling in details for CNT ( circuit not tested) surely there is no details put in the full thing is left blank?
Thirdly when carrying out % testing what system do use use to identify what has been tested ( obviously you can see from reports) but does any one put say coloured dots on each year different colours each year ?
If we are doing a percentage test over 5 years we will break it down to complete distribution boards . Keeps the paper work tidy and clearer what is tested .instead of different dates and stickers on radium circuits. We do find if we follow a different contrator who has stated a 20% test ,they have cherry picked all the easy circuits to test !!!! I believe the correct way for a percentage test is 100% First year then if its given a 5 year ticket 20% every year .of course it does seem made testing and inspecting circuits that where only tested 1 year ago .but if you waited 5 years to carry out the first 20% test there would be a gap of 10 years until the last 20% gets tested. This method works well on large sites as it can spread the customer budget.
 
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