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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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    In any domestic you don't care anyway as the ultimate current limiter is the DNO fuse, and the whole CU rating thing is based on that fuse.

    Yes - that's exactly my point (if not well expressed). If the DNO's fuse is "dunno" you can't then say that the conditional rating of the CU is acceptable - whereas if you can at least say it's a BS 1361 (or equivalent) rated at no more than 100A (based on the label on the carrier) then you can reasonably claim that it is. If it turns out to be a 80A or 60A then it doesn't matter.


       - Andy.
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  • 0
    In any domestic you don't care anyway as the ultimate current limiter is the DNO fuse, and the whole CU rating thing is based on that fuse.

    Yes - that's exactly my point (if not well expressed). If the DNO's fuse is "dunno" you can't then say that the conditional rating of the CU is acceptable - whereas if you can at least say it's a BS 1361 (or equivalent) rated at no more than 100A (based on the label on the carrier) then you can reasonably claim that it is. If it turns out to be a 80A or 60A then it doesn't matter.


       - Andy.
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