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EICR Certification DNO Fuse

Chivers
What are peoples thoughts on completing Certificates with regards to DNO fuses.


When you complete a Certificate Technically you do not remove the DNO Cut out fuse so you do not know 100% what the Fuse size is so would you personally put the fuse down as a 1362 type 2 and note down the rating advised by the Supplier or put this down as a Limitation? Up to this week I had normally put the rating as Written on the Fuse carrier by the DNO so 100A = 100A , 80a = 80a etc... I test the ZE/ZS at the closest place to the Suppliers cut out & note this down as the EFLI.


A colleague of mine has recently been "critical" of this stating we should be putting it down as a limitation as we can not guarantee the fuse is exactly what it says on the carrier.
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    I got a letter from the DNO that said (Urgent action required) we are going to change your electric meter, in order to maintain a safe and reliable electricity supply to your property.   ( We are not installing a smart meter). If the meter is fitted is stutated outside we will endeavor to change it and an appoitment is not always necessary. Anyhow they came at the appointed time, and I bounced the meter changer about this safe and reliable supply.


    I took this letter the wrong way ,he said they have a program of changing all meters over 20 years old, and part of their job was to tighten the supply cables inside the cut-out as over time the copper conductors can soften and become loose, he did get a turn because I was looking , and also opened the HRC cover to check the mains fuse. So best to do a visual inspection of the cut in as with BS7671 that recommends this to be carried out.


    On a different note, if you had arcing in the cut out or sometimes called a cut in would the  small rated AFDDs detect arcing downstream and trip (don't think so really) but it is going to be Hell to find the cause in the upstream circuits. Can you even use a pulsating Loop tester, or just tell another lie as with MCBs that all is well in your report without testing.


    jcm
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  • 0

    I got a letter from the DNO that said (Urgent action required) we are going to change your electric meter, in order to maintain a safe and reliable electricity supply to your property.   ( We are not installing a smart meter). If the meter is fitted is stutated outside we will endeavor to change it and an appoitment is not always necessary. Anyhow they came at the appointed time, and I bounced the meter changer about this safe and reliable supply.


    I took this letter the wrong way ,he said they have a program of changing all meters over 20 years old, and part of their job was to tighten the supply cables inside the cut-out as over time the copper conductors can soften and become loose, he did get a turn because I was looking , and also opened the HRC cover to check the mains fuse. So best to do a visual inspection of the cut in as with BS7671 that recommends this to be carried out.


    On a different note, if you had arcing in the cut out or sometimes called a cut in would the  small rated AFDDs detect arcing downstream and trip (don't think so really) but it is going to be Hell to find the cause in the upstream circuits. Can you even use a pulsating Loop tester, or just tell another lie as with MCBs that all is well in your report without testing.


    jcm
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