Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Replies 10 replies
  • Subscribers 34 subscribers
  • Views 2246 views
  • Users 0 members are here
Options
You may also be interested in

Extractor fans that do not require a 3 amp fuse ?

aligarjon

Hi guys.  i am struggling to source a bathroom  extractor fan with a short spigot that doesn't require a 3 amp fuse. Most of them seem very long to what they used to be which is a right pain sometimes. I only have 90mm to play with for the spigot and the existing only has a 3 pole isolator but no fuse. It would be a nightmare to alter as all the wiring is at the light switch and there is no access from above to try and alter it.  I usually use Vortice as they don't require the fuse but can't find one with a short enough spigot. I seem to remember there was another brand that didn't but can't remember what it is if anyone knows ? The fan is for a shower room ceiling although it is out of zones due to height .

Cheers

Gary

  • 0

    Would a combined 3 pole isolator with integral fuseholder be of any use to you - swap out the existing one?

    www.toolstation.com/.../p19707

  • 0 in reply to whjohnson

    Thanks for the reply. I have managed to find something suitable.  A Greenwood Unity CV2GIP smart timer with humidistat if anyone else in the same boat.   cheers

  • 0 in reply to whjohnson

    a combined 3 pole isolator with integral fuseholder

    Would such a device comply with BS 7671? I'm guessing the fuse is in just one of the L poles, leaving the other protected by the upstream lighting MCB. By BS 7671 definitions, the 3A fuse, being an overcurrent protective device, creates a new circuit, so we now have two distinct circuits but both sharing the same neutral - a contravention of 314.4. Granted most of the physical reasons for not borrowing a neutral probably don't apply in this particular circumstance, but I think it would still be tricky to be able to sign off as compliant.

      - Andy.

  • 0 in reply to AJJewsbury

    It wouldn't isolate both lives as far as i can see. The switch live would still be on if the light was on even if the permanent live is off..

    Gary

  • 0

    No fans actually require a 3A fuse. Fuses etc. are to protect the cable.

    If you actually want a fan where the manufacturer does not wrongly tell you you need a fuse, then buy one in Europe.

  • 0 in reply to geoffsd

    Indeed, a B6 mcb will pop a lot sooner than a 3A fuse will.

  • 0 in reply to whjohnson

    Fuses etc. are to protect the cable.

    So what protects the internals of the appliance? What's to stop the manufacturer specifying that the installer provide something on the supply side instead of having an extra protective device internally? (as seems to be the case here, and appears to be permitted by the equipment standards)

    Indeed, a B6 mcb will pop a lot sooner than a 3A fuse will.

    Not if the fault current is limited (e.g. due to a short between turns of a motor winding) - at 5A or 6A for example the 3A fuse will go far sooner.

      - Andy.

  • 0 in reply to AJJewsbury
    AJJewsbury said:
    So what protects the internals of the appliance?

    A device fitted internally by the manufacturer as they do when necessary.

    AJJewsbury said:
    What's to stop the manufacturer specifying that the installer provide something on the supply side instead of having an extra protective device internally?

    Why should that be considered acceptable?

    Are you suggesting that, for example, fan manufacturers make their products less safe for the UK than they do for places where such fuses are not available and the item would be on a 16A circuit?

  • 0 in reply to geoffsd

    Are you suggesting that, for example, fan manufacturers make their products less safe for the UK than they do for places where such fuses are not available and the item would be on a 16A circuit?

    I'm not sure they do go on 16A circuits on the continent - the French diagrams I've seen always put them on a separate C2 MCB.

       - Andy.

  • 0

    The monsoon ipx5 by national ventilation is my go to in most cases , and has an internal 3a fuse on the circuit board .

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines