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How closely does BS 7671 track IEC 60364?

wallywombat
I understand that BS 7671 is notionally derived from IEC 60364, but how closely does it actually track it? The Wikipedia page for IEC 60364 shows that it has many of the same chapters, although for example some of the part 7 sections are missing / different.


So for example if I looked at section 521 say in both standards, would I expect to see the exact same sequence of 521.x.y.z's (apart from the occasional .20x) with exactly the same content?


Also, how are amendments handled? E.g. for the proposed Amendment 2 changes, are these things that have already been added to IEC 60364 (such as part 8) and are now migrating into BS 7671? Plus I guess some things that the IET has proposed on their own? For the latter, will they be added unilaterally to BS 7671 then might get backported to to IEC 60364 at some point in the future if the IEC approve? And if they don't approve, we just live with the divergence?
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    I'm not sure about 521 in particular, but in general I think it's safe to assume that there must be some very significant differences, at least in places. Just compare other standards that should equally be based on 60364 - e.g. the French NFC 15-100 or German DIN VDE 0100. Ring circuits, bare c.p.c.s, reduced c.s.a. c.p.c.s., steel CUs to mention just a few of the more obvious ones.


    I suspect that what we see in the DPCs are often based on IEC or CENELEC work, but as the published versions often differ again (at least in wording if not in intent) then there must be some room for UK deviation in those cases too.


    I'm sure there must be some mechanism for feeding back to CENELEC and IEC, but whether it's based on BS 7671 or by some separate committee I don't know.


        - Andy.
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    I'm not sure about 521 in particular, but in general I think it's safe to assume that there must be some very significant differences, at least in places. Just compare other standards that should equally be based on 60364 - e.g. the French NFC 15-100 or German DIN VDE 0100. Ring circuits, bare c.p.c.s, reduced c.s.a. c.p.c.s., steel CUs to mention just a few of the more obvious ones.


    I suspect that what we see in the DPCs are often based on IEC or CENELEC work, but as the published versions often differ again (at least in wording if not in intent) then there must be some room for UK deviation in those cases too.


    I'm sure there must be some mechanism for feeding back to CENELEC and IEC, but whether it's based on BS 7671 or by some separate committee I don't know.


        - Andy.
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