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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

    AJJewsbury:

    Just as long as the FCU is capable of being secured if it can't be supervised by someone working on the boiler - most are these days - but not all were. Also capable of breaking N as well as L if it's a TT system.

      - Andy.




    Yes Andy, the switched fused connection unit is immediately the other side of the outside wall and can be controlled by anyone working on the oil boiler. Its fuse can be removed and it can be directly under the control of the person working on the oil boiler. There is a house door right next to the oil boiler and a window so that the switched fused connection unit can be observed at all times. The boiler engineer showed me an internal mains plug that can be removed inside the boiler casing to disconnect the mains supply when he is working on the boiler. I can see no real reason for an outside extra rotary disconnecting isolator switch next to the oil boiler, but the boiler installer's mate said that "their electrician" normally fits one. I can see no harm in fitting one but it is extra work and expense.


    Z.

Reply
  • 0

    AJJewsbury:

    Just as long as the FCU is capable of being secured if it can't be supervised by someone working on the boiler - most are these days - but not all were. Also capable of breaking N as well as L if it's a TT system.

      - Andy.




    Yes Andy, the switched fused connection unit is immediately the other side of the outside wall and can be controlled by anyone working on the oil boiler. Its fuse can be removed and it can be directly under the control of the person working on the oil boiler. There is a house door right next to the oil boiler and a window so that the switched fused connection unit can be observed at all times. The boiler engineer showed me an internal mains plug that can be removed inside the boiler casing to disconnect the mains supply when he is working on the boiler. I can see no real reason for an outside extra rotary disconnecting isolator switch next to the oil boiler, but the boiler installer's mate said that "their electrician" normally fits one. I can see no harm in fitting one but it is extra work and expense.


    Z.

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