Not exactly a dodgy trade pic but at a small job yesterday noticed the doors on the CU cupboard just inside the front door - why would anyone bother ?!! The current owners have lived there for 3 years and never spotted it ! :)
I think they'll only accept TT for what they class as temporary supplies but once the fixed installation is complete it's fine to connect to the DNO earth.
I'd try plugging in a simple socket tester at a convenient socket or 2 which will instantly give you an idea of whether it's just the shower circuit that's reverse polarity or the entire installation. I wonder if there's been a meter upgrade recently ?
When you compare the relative ease and low cost of getting the cables well out of the way of the woodburner with the potential future problems coupled with serious access issues after it's installed I'd say it's the only sensible option really.
I don't think that would do very much to prevent the heat getting to the pvc insulation and eventual heat damage may well be inevitable. Much better to disconnect the cables and reconnect together as required remotely from the Wood Burner, I know that's probably easier said that done but they...
I'd say that's a very fair price - a lot of people also don't realise that a good and properly registered Electrician has considerable overheads to cover, I'd suggest more than any other trade. 10 hours for thorough testing, the actual CU replacement and the certification is also realistic and...
Without any intention of causing offence I believe that you have a very poor knowledge of requirements for protection against shock and I strongly advise you to get an Electrician in for safety's sake.
Exactly, without any additional RCD protection and say a Ze of 80 ohms you'd have a dead short live/earth current of around 3 amps, wouldn't worry even a 6a MCB so all the earthed metalwork sits at mains voltage. :)
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