electricalforum.nz

Under 3000:2018, which presumably NZ will eventually cite, sections 2, 3 & 4 of the book has a new paragraph at the beginning.
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Installed in accordance with the requirements of this Section, and the additional requirements as specified in the manufacturer’s instructions.
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If an induction hob has a rating of 45A for example, are we now required to install a circuit capable of 45A, or are we still allowed to apply diversity, or limitation on the final subcircuit?
C2.5 & C2.5.3 etc

Do the MIs specifically say it needs a circuit to cover full load?

Or are the MIs just saying that the full load is 45A and not actually indicating any requirements to the installation circuit

That's my thoughts as well.
But some in the trade think that everything in the MIs override 3000.

if the MIs just state a load current, then we can still apply diversity to FLC.
But if MIs specify a cable size or circuit rating, then that would be the minimum; and the 2018 edition will require us to comply.

Which can be a problem if the MIs are written for US market; where V is 110 & A for any given W is correspondingly higher .

Also bear in mind what ESR 14A says about requirements for MIs.
Effect is that MIs can over-spec; but are unlawful if they under-spec .

We can rely on them "in good faith"; but if we do we would certainly be "using" them - and therefore have to attach them to CoC

If you follow good trade practice ; you're unlikely to ever be held to task over a technical non-compliance with MIs;
which will mostly have been lost long before anything happens.
So personally I think I'll continue to ignore parts of MIs that are clearly wrong in NZ context.