Instead of a normal load and an E7 load, you have only one which is being shared by both meters. Therefore your clients bill is being split between usual price and E7 price. Fraud, intentional or otherwise. I wouldn't touch it.
Not in BS7671 that I can think of, or any reason for there to be. neither is really a dangerous situation. Fully clothed in generally dry conditions like these, there isn't a need for special regulations.
Just trying to give a suggestion for a compact consumer unit/ changeover switch layout. Sorry if you've found it offensive or space wasting in any way.
We use this setup a lot in our telecoms cabinets. A 12way Spelsberg or Hensel enclosure, with a 32amp appliance inlet mated to it. Inside the enclosure, a KH80T902 K&N co switch din rail mounted, takes up 5 modules, main switch or RCD and up to 4 or 5 circuits. You can get away with 9 module...
Are you sure the 1.5mm lighting is on a 16A? other than that, I see nothing (ordinarily) wrong with having a 2nd CU. If there's nothing wrong with it apart from maybe incorrect MCB choice, why go to the trouble, and expense to your customer, of changing it.
This may not be suitable for you, but try Down Under Tradies in Acton. They do or did a home study DVD, and you can sit the exam at their premises. I wouldn't recommend it if you aren't a practising electrician with 16th
if you belong to NICEIC, SSE (down this neck of the woods anyway) say you can cut the seal yourself and ring them when you're finished to re seal. Why aren't they all as simple as that?
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