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TNCS 6mm main earth - EICR

Stewart Mason
Just wondering what peoples first thoughts are on a 6mm main earth. 0.27ze, TNCS. 80A 1361 main fuse.


Iv'e tried doing a search on here but it did not come up with any results. (Maybe user error!). I'm sure this subject would have come up before.


Thanks
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    Andy,

                    where did you get your 0.3S from please? From a Fig 10 of the 15th edition for an 80 Amp B.S. 1361 fuse and 850 Amps, I got about 0.7 second.



    BS 7671:2018 appendix 3 Fig 3A1 (admittedly that's to BS 88-3 rather than BS 1361 but as it's a direct replacement standard it shouldn't be too far different) - double checked by the inset table - 850A falling between the 960A for 0.2s and 800A of 0.4s.


    I admit I really should have looked up a proper BS 1361 table - I know the BS 88-3 values aren't exactly the same (indeed a few of the ratings aren't), but I'd be surprised if wasn't in the same ball park.


       - Andy.
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  • 0

    Andy,

                    where did you get your 0.3S from please? From a Fig 10 of the 15th edition for an 80 Amp B.S. 1361 fuse and 850 Amps, I got about 0.7 second.



    BS 7671:2018 appendix 3 Fig 3A1 (admittedly that's to BS 88-3 rather than BS 1361 but as it's a direct replacement standard it shouldn't be too far different) - double checked by the inset table - 850A falling between the 960A for 0.2s and 800A of 0.4s.


    I admit I really should have looked up a proper BS 1361 table - I know the BS 88-3 values aren't exactly the same (indeed a few of the ratings aren't), but I'd be surprised if wasn't in the same ball park.


       - Andy.
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