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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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  • Personally I have found a fair number if burnt out fused switched spurs in immersion circuits, I generally also install 20A double pole switch with Neon. The diagram showing markings on a switch approved for isolation is interesting. I can only see one switch from hager that has this sort of markings. Not having access to BS EN 60669-2-4:2005 I wonder if the markings are actually a requirement? Although as others have said if you actually want to isolate an immersion heater it would probably be done at the the consumer unit.

    On the suggestion of a rotary isolator I think it just looks out of place inside a home and I would only use one if essential for safety requirements.

  • in reply to Alan B
    Alan B said:
    Personally I have found a fair number if burnt out fused switched spurs in immersion circuits, I generally also install 20A double pole switch with Neon. The diagram showing markings on a switch approved for isolation is interesting. I can only see one switch from hager that has this sort of markings. Not having access to BS EN 60669-2-4:2005 I wonder if the markings are actually a requirement?

    I can answer this ...

    Not all switches to BS EN 60669 series are isolating switches ... as we can see from Table 537.4 of BS 7671, from BS EN 60669 series, only those to BS EN 60669-2-4 are listed as suitable for isolation:

    In terms of marking for isolating switches to BS EN 60669-2-4, the marking for isolation should be visible once the product is installed:

    'OFF' and 'ON' are suitable alternatives for Ι and Ο.

    If the switch conforms to another part of BS EN 60669 in addition to BS EN 60669-2-4, it will be suitable for isolation, BUT it should be marked as above.

  • in reply to Alan B

    While this is fine for an Electrician to isolate at the CU what would a Plumber or Heating engineer make of it?  Are they competent to Lock Off and isolate at the consumer unit?  Should a plumber or heating engineer even touch the customers consumer unit?

    Alan B said:
    On the suggestion of a rotary isolator I think it just looks out of place inside a home and I would only use one if essential for safety requirements.

    Rotary isolators do look industrial and the average person in a dwelling will find them unsightly

      

Reply
  • in reply to Alan B

    While this is fine for an Electrician to isolate at the CU what would a Plumber or Heating engineer make of it?  Are they competent to Lock Off and isolate at the consumer unit?  Should a plumber or heating engineer even touch the customers consumer unit?

    Alan B said:
    On the suggestion of a rotary isolator I think it just looks out of place inside a home and I would only use one if essential for safety requirements.

    Rotary isolators do look industrial and the average person in a dwelling will find them unsightly

      

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