OP
SPARTYKUS
Its not just about a fault on the tub, you should TT a hot tub, its all about the potential difference between true earth and the MET (PME)
Its the failure of the PME thats the worry here,
Why? because 1 in ten million have temporarily lost the neutral that is subsequently fixed pronto?
Plus class 1 fittings in and around the tub could be a problem.
personally i would TT a hot tub
So you prefer to rely on a device thats proven to be unreliable and subject to high failure rates (the RCD) for disconnection! Theres a lot more chance (probably several orders higher) of the RCD failing than the PME neutral being lost.
Don't get me wrong I am not a fan of PME (TNS all the way) but .... the logic puzzles me. Loss of neutral is unheard of. And fixed quickly the miniscule few times it happens. RCD failure is rife and often never checked, fixed or found. Especially when they're fitted by a "friend" that has 'acquired' the board and RCD and has no registration, invoice, and more importantly, test equipment. Changed a few things for a mate who had the board changed 8 years ago, as above, RCD was kaputt. Probably never worked. How would we know? It was never tested.
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