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Not sure I fully agree with Wiring Matters > Years > 2025 > 107 - September 2025

Sergio Fernandez

electrical.theiet.org/.../

Personally I think Rotary Isolator would be far better than 20 amp Double-pole switch shown Fig 2 as this allows for isolation and LockOff/LockOut

The cost of the Rotary Isolator is still quite low see URL below.  (Other brands and other Wholesalers are available).


www.superlecdirect.com/.../



As always please be polite and respectful in this purely academic debate.





Come on everybody let’s help inspire the future

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  • I. have come across many heat damaged spurs and the occasional socket over the years supplying immersion heaters so agree with that part. I personally always fit. a 20 amp DP switch. I don't see the need to have to lock it off as you will be working right next to it. If it needs locking off for other reasons do it at the consumer unit as it should be a dedicated circuit although I have seen an odd boiler or heating control tagged onto the same circuit.  Rotary switches are clunky and could be prone to being inadvertently damaged or knocked off the wall in an airing cupboard.

    Gary

  • in reply to aligarjon

    if you can lock it off at the CU and are feeling cheap you can probably drop the switch rated for isolation part altogether.

    Its main use is not for us to work on it once in a blue moon, but for the householder to turn the water heating off when not needed - while on hols or similar . 

    Fused spurs only make sense when the supply (dedicated or shared with others), is of a higher rating - e.g a 32A ring. 
    To me another obvious fix if you must have one, may be  to put the fused spur unit outside the cupboard. much as one used to put conventional light switches outside bathrooms. being visible  also reduces the risk of it being left in the wrong state for a long time.
    Mike

  • in reply to mapj1

    Not like you to post such gibberish Mike presuming this post was meant as a reply to what I wrote.

    Gary

  • in reply to mapj1
    mapj1 said:
    Its main use is not for us to work on it once in a blue moon, but for the householder to turn the water heating off when not needed - while on hols or similar . 

    Or to turn it on once in a blue moon when the boiler has conked out.

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  • in reply to mapj1
    mapj1 said:
    Its main use is not for us to work on it once in a blue moon, but for the householder to turn the water heating off when not needed - while on hols or similar . 

    Or to turn it on once in a blue moon when the boiler has conked out.

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