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Adding spurs to immersion heater circuit

MikeD

About 25 years ago we had a shower fitted and the plumber added a fused spur to the immersion heater circuit for the pump.

I want to upgrade our heating system by fitting an ebus controller in the airing cupboard. This needs a mains supply and there is no accessible ring circuit. Is it permissible to add another fused spur to the immersion circuit?

Mike

Parents
  • 0

    The term "spur" can be correctly applied to a radial circuit (as well as rings) - have a look at Fig 15B on p556 of BS 7671 - the usage is probably most significant where the spur'd cable wouldn't be protected from overload by the circuit OPD (so you'd limit the load by restricting the number of outlets or downstream fusing), but it's still the same logic.

       - Andy.

Reply
  • 0

    The term "spur" can be correctly applied to a radial circuit (as well as rings) - have a look at Fig 15B on p556 of BS 7671 - the usage is probably most significant where the spur'd cable wouldn't be protected from overload by the circuit OPD (so you'd limit the load by restricting the number of outlets or downstream fusing), but it's still the same logic.

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Or look in the definitions where a spur is simply defined as " A branch from a ring or radial final circuit.".

    I suspect any confusion arises from the misuse of "spur" when talking about a "Fused Connector Unit".

  • 0 in reply to geoffsd

    I suspect any confusion arises from the misuse of "spur" when talking about a "Fused Connector Unit".

    Spot on Geoff

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