Only Hager could answer the question as to whether they say the MTN is compatible with the MT unit.
OK, I take the point regarding "no less safe", but if someone made it "less safe" in the first place, that's no excuse for another installer to follow suit.
Finally, no-one (including BS 7671) has said you can't fit other devices into a consumer unit, but that the original manufacturer won't be responsible for the assembly. This is clearly logical and reasonable, and was also the case before BS 7671 reminded us about it - a manufacturer can only test what they know, not every eventuality! This also might help:
The thing with that old chestnut is that in reality it is just pure protectionism. All such kit has to be made to BS60898 for example, and that should be good enough. Just look at who comprises the BEAMA membership roll for the answer. Also, many manufacturers use a common supplier of mcbs and just re-label them with their own branding. So does this mean that a different label on 2 identical mcbs makes them incompatible?
The thing with that old chestnut is that in reality it is just pure protectionism. All such kit has to be made to BS60898 for example, and that should be good enough.
That depends upon how specific the BS is. It would be a queer business if one could only use MK plugs in MK sockets. However, the two types of Wylex MCB are certainly not interchangeable - the busbar won't fit.
The thing with that old chestnut is that in reality it is just pure protectionism. All such kit has to be made to BS60898 for example, and that should be good enough.
That depends upon how specific the BS is. It would be a queer business if one could only use MK plugs in MK sockets. However, the two types of Wylex MCB are certainly not interchangeable - the busbar won't fit.
