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Many thanks all. Switchfuse it is.

Securespark - The electrician with the quote talked the talk and convinced me how outdated I was with my knowledge. That's why I'm checking here.

Are there three options then? 1. Switchfuse as ban-all said. (Although I am several years ex electrician I would have used a switchfuse) 2. Just an mcb and isolator as steve said. (There is an mcb and rccbo on the spa (not mccb as I wrongly wrote in my first post) (I was working with a...

There is overload protection on the spa end. But I could then just swap the isolator for an mcb?

Hi I am wiring in a 46amp spa directly from the service block. The spa has it's own mccb etc rated at 63A. I am using 15 meters of 10mm 3 core SWA. Am I right in thinking all I need at the service end is an RCD and isolator straight from the service block? (as shown) Many thanks.