Im not saying you're not right B-A-S, I accept 100% what you are saying. I was just curious if you had ever seen it/come across the situation before.
At the same time, I do feel that the problem with the OP is potentially something unconnected to the hot tub but unfortunately had coincided with it being installed. That is unless of course it was installed by Steptoe & Son and thus could have any number of issues.
even at 32 amps, it's hardly a huge load when compared to other items available for installation on the domestic electricity installation of a property.
What is important is that if you do connect a large load which does cause problems you are in contravention of the agreement you signed , and you can be cut off.
I am aware of three people who have been told to stop using machinery on their domestic supply as it was affecting the supply to adjacent properties. One involved a 2 kW motor that had not been declaed to the DNO. Had it not been that there were young children in the house the supply would have been cut off when he persisted in using the machinery and ignoring letters from the DNO. I don't know what was done to force him to stop using the machinery but he dd eventually stop using it. ( fast acting mains fuse maybe )
Now to me, that could well mean that if you have say a 100 amp supply from the DNO, then (providing demand and diversity have been taken into account) as long as you don't exceed that supply capability you do not need to notify them?
If your load exceeds the contracted maximum ( 15kW in most cases ) then you would be in breach of contract with the DNO. The supply company ( to whom you pay the bill ) are unlikely to make any comment if they realise you taking more than the 15kW ( it is more profit for them )
As has been rightly said before by Flameport, it's unlikely that it's the hot tub causing the lights in another property to flicker every few minutes (but not impossible I agree)
Rather than focussing on the neighbours hot tub it would be more prudent to get an electrician in to diagnose any faults before pointing fingers and dropping somebody in it when they may have done nothing really wrong.
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