In the bit of photo we can see, it looks rather like the dreaded loose neutral screw effect  again - the live wires at the top out of shot I presume are in tip top condition ? 

Are they implying by their statements about your consumer unit,  that their design is not adequately protected against a perfectly credible overload condition ?

I suggest collecting pictures of all the bits, as well as what wire sizes have been used.

I assume its one of these https://www.metermarket.co.uk/product/eastron-sdm230-mbus-mid-single-phase-direct-connected-100a-energy-meter.

15KW is a lot, but a 100 fuse and 230V suggests max steady load of 23kW, plus transient excursions above that - was the installation  not foreseeing a likely level of load ?

M

Thanks, I had a gas boiler and no EV at the time of installation

My incoming fuse is rated at 80A and I have no issues, but these meters are rated at 100A and one is on a circuit protected by a 50A breaker. I am having trouble with the maths saying it was overloading issues if I haven't been over 80A?

indeed and I'm not too clear what section is protected by what,

-but as described  I'm struggling to see

a) how they think you have overloaded it

b) if that really is what they think, why they designed you a system that could not handle the likely current.

And more likely if the neutral is burnt but not the live, that is a classic 'one loose screw' issue - both sides should look equally cooked as they carry identical current.

M.

indeed and I'm not too clear what section is protected by what,

-but as described  I'm struggling to see

a) how they think you have overloaded it

b) if that really is what they think, why they designed you a system that could not handle the likely current.

And more likely if the neutral is burnt but not the live, that is a classic 'one loose screw' issue - both sides should look equally cooked as they carry identical current.

M.

But how do I fight one of the 'big boys' to admit they're at fault?