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Immersion & Heating system on same circuit

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  • 26-06-2013 9:15pm
    #1
    LostInLM
    Registered Users Posts: 105 ✭✭


    Hi,

    Is it within regulations to have the immersion and central heating system ( oil boiler, circulation pumps etc.) supplied from the same 2.5mm T&E circuit?


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    #2
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    there's a section in the back of the rules annex 55a(normative)

    says immersion should have 'individual circuit' and small items eg:pumps in the hotpress can be fed from cct



    why do you ask?

    it certainly isn't standard practice to do this


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    #3
    LostInLM
    Registered Users Posts: 105 ✭✭LostInLM


    mikehammer67 wrote: »
    there's a section in the back of the rules annex 55a(normative)

    says immersion should have 'individual circuit' and small items eg:pumps in the hotpress can be fed from cct



    why do you ask?,

    it certainly isn't standard practice to do this

    Was in parents house at weekend and noticed that oil boiler circuit (Inc pumps) were tapped off back of immersion switch. Immersion and boiler are never used at the same time.

    What's normal arrangement for these circuits?


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    #4
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    boiler can be wired on an independent circuit or as a spur from a socket circuit

    the immersion is wired on an independent circuit


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    #5
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,593 Mod ✭✭✭✭2011


    LostInLM wrote: »
    Hi,

    Is it within regulations to have the immersion and central heating system ( oil boiler, circulation pumps etc.) supplied from the same 2.5mm T&E circuit?

    555.3.3 (page 138 of ET:101) States:
    It is permissible to supply auxiliary equipment associated with water services and water systems from the circuit supplying a water-heating device.

    My interpretation of that is that the above is not in breach of the regulations.

    I would expect a standard 3kW immersion to draw about 13A and everything else combined to draw no more than 2A.

    A 20A B type MCB can provide suitable protection to a 2.5 T&E
    Personally I don't see a problem.

    However if I was wiring from scratch I would have them on separate circuits.


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    #6
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    "auxiliary equipment associated with water services and water systems"


    not sure that refers to items like oil boilers


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    #7
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,593 Mod ✭✭✭✭2011


    mikehammer67 wrote: »
    not sure that refers to items like oil boilers

    Why not? Boilers have quite a bit to do with water, they heat it!

    Besides hey are a tiny load.


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    #8
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    2011 wrote: »
    Why not? Boilers have quite a bit to do with water, they heat it!

    Besides hey are a tiny load.

    555.3.2
    a circuit supplying auxiliary equipment associated with water service and water systems (eg:pumps)...........


    annex 55a

    (practical application of the rules)

    3.1
    the following items should be fed by individual circuits.
    permanently connected heating appliances >10A,eg.storage heaters...........

    small ancillary items eg:fan,water pump may be fed from such a circuit.......


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    #9
    Dardania
    Registered Users Posts: 3,612 ✭✭✭Dardania


    Isn;t thee something about circuits supplying devices which touch water have to be ELCB protected, so use an RCBO now?

    As 2011 says I'd put them on separate circuits, just be aware of RCBOs if changing anything


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    #10
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,593 Mod ✭✭✭✭2011


    mikehammer67 wrote: »
    555.3.2
    a circuit supplying auxiliary equipment associated with water service and water systems (eg:pumps)...........


    annex 55a

    (practical application of the rules)

    3.1
    the following items should be fed by individual circuits.
    permanently connected heating appliances >10A,eg.storage heaters...........

    small ancillary items eg:fan,water pump may be fed from such a circuit.......

    Sorry I don't follow. Which part do you feel does not align?

    I see the boiler as a very small load that is part of the water/heating system.

    I agree that it is best to the boiler on a sperate circuit, but would not feel that it was breaking any regulations if it was not.


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    #11
    mikehammer67
    Closed Accounts Posts: 699 ✭✭✭mikehammer67


    2011 wrote: »
    Sorry I don't follow. Which part do you feel does not align?

    I see the boiler as a very small load that is part of the water/heating system.

    I agree that it is best to the boiler on a sperate circuit, but would not feel that it was breaking any regulations if it was not.

    seems pretty clear to me 2011

    555.6.1
    electrical equipment in domestic airing cupboards....shall be confined to the following

    -an immersion heater........
    -auxiliary equipment associated with water-heating systems

    it's quite obvious from the 2 rules and annex 55A which is the practical application of the rules

    that they are saying a pump or similar in the hotpress may be connected to immersion cct


    not a oil boiler,pumps etc as in the ops case


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