I would feed the oven on 16a through a dp 20a switch
And feed the hob on a 40a circuit using a 45dp switch
If you want them to look the same side by side use 2x45a dp switch
* if you use a fuse spur instead or plug and socket use good quality Hagar ect
I think the op is saying mains installation is pme
That is the problem with back up generators people fit them and do not cheak readings and results ensuring breakers / switchgear would be suitable when on back up
You would normally expect a lot less if it is directly generator fed
It could be something to like a generator through a transformer/ inverter
Or floating n in generator
I would tt it to be honest better safe than sorry also I wouldn’t be to worried about catenary wire if it is fixed to anything other than metal the supply side
First off blank the switch to give every room a pl
Then drop the live Greg feed into pir
Out of pir into light
Plenty of lights now com with a microwave senser as a option in that case Greg flex straight into light
Had exactly the same once turned out tncs system loose n in metre witch had recently been changed dam metre monkeys witch in turn under high load shower ect the high resistance made earth lower potential than n return try clamp metre on gas and water while shower is on or voltage indicator
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