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Oil Boiler Isolation Switch.

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Evenin' All,


Regarding an external ground sited domestic oil fired boiler for heating and hot water that has an internal switched fused connection unit nearby inside the house, what regulations will require an external electrical isolator adjacent to the oil boiler? You know the sort of thing, a double pole rotary isolator. 


Z.


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  • 0
    The boilers of this type I have wired may have a built in immersion heater and need their own 16-amp circuit.


    So generally from the internal SFCU or DP switch I run three core SWA with a core used as a CPC to the boiler main switch that is built into the boiler control panel, then bring a multi-core SWA back in to the controls wiring centre.


    If you turn the supply off at the boiler it disconnects both the boiler and the heating controls as it does if you turn it off at the internal SFCU/ DP switch which should avoid any nasty surprises without an external rotary isolator.


    The boilers with a built in back up immersion heater usually have a two way rocker switch making it a choice between running the boiler or the immersion heater.


    Andy Betteridge
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  • 0
    The boilers of this type I have wired may have a built in immersion heater and need their own 16-amp circuit.


    So generally from the internal SFCU or DP switch I run three core SWA with a core used as a CPC to the boiler main switch that is built into the boiler control panel, then bring a multi-core SWA back in to the controls wiring centre.


    If you turn the supply off at the boiler it disconnects both the boiler and the heating controls as it does if you turn it off at the internal SFCU/ DP switch which should avoid any nasty surprises without an external rotary isolator.


    The boilers with a built in back up immersion heater usually have a two way rocker switch making it a choice between running the boiler or the immersion heater.


    Andy Betteridge
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