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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
  • 0
    6 sqmm may satisfy 543.1.3, but note 542.3.1 and 544.1.1  As I read it, the minimum size of the earthing conductor is 10 sqmm because that is the minimum size of the main protective bonding conductor. That is perfectly sensible where there is a MPBC, but if none is required (because of plastic utility pipes), it does seem to be a bit silly. Such is BS 7671!
  • 0
    I think that the D.N.O. has a say in minimum main protective conductor sizes. Does Table 54.7 apply? A common size is 16.0mm2 for main protective conductors at the intake position in homes and small offices/shops/flats etc.


    If 543.1.3 (applicable for disconnection times up to 5 seconds) is used, will the result still be approved by the D.N.O?


    Z.

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