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Rules on Spurs

Airconditioningman

Sorry in advance if this is a silly question, but I’m having a few issues with the electrics on an Air Conditioning install in England. The installation is on a domestic property and the house is very large which means that it’s incredibly impractical to run a new cable as the architects made sure to use all available space as living space so there are no voids or attics that can help us.

My question is, what is the maximum amount of power that we can take from  ring main that has no existing spurs on it please. I know we can have a 13a fused spur, but is there any way to get more than 13a without adding a new circuit please? The electrician is saying that 13a is the maximum, but I always thought that t was a little more. 

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  • 0

    I don't see why you cannot split the ring and add further length, but if that requires > 13 A (how much more?) that leaves very little for the rest of the sockets.

    Perhaps the architects should have thought of the air-con in the first place?

  • 0 in reply to Chris Pearson

    I need 15 amps. Is this allowable in any reasonably achievable way please? In terms of the architects, the less said the better. The house has no ventilation, huge windows and needs an absolute tonne of AC installing because of poor material and design choices that have created an incredibly unusable house. It was 27 degrees in a bedroom the other day with no heating in use and an outdoor air temperature of 15 degrees!

  • 0 in reply to Airconditioningman

    Could you please specify which ring circuit you are looking to supply from? Are you referring to those servicing the kitchen area or the upper floor etc ? 

  • 0 in reply to AMK

    could be possible provided that, under the intended conditions of use, the load current in any part of the ring is unlikely to exceed for long periods the current carrying capacity of the cable as installed, assuming the cable has a installed rating of 20 amperes. 

  • 0 in reply to AMK

    Luckily the house has quite a few rings, it could be the rear top floor ring, or the middle floor rear ring. Both rings are just bedrooms and a study on the middle. 

  • 0 in reply to AMK

    Or as Chris suggested, split the ring over two 20 Amp radials. But again would need to check current carrying capacity of the cables as installed.

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