Extend new circuit from outhouse into another property with an existing supply, which is bad idea or not allowed?

AJJewsbury:

Is something I am doing here not allowed?

I don't think it's completely prohibited, but you're certainly skating on very thin ice.

 

Can I just get electricity supply from the outhouse to Building B and extend and use the earth of sockets already in Building B?

In principle yes, but there are some very significant practical problems. How would isolation of building B work if an earth fault (or just standing earth leakage) could energise building B's earthing system from building A's supply? How would you satisfy the requirement for c.p.c.s within cable to be earthed in the same installation as the associated protective device, or where an overcurrent device is used for fault protection that the protective conductor be incorporated into the same wiring system as the live conductors or their immediate proximity?


I'd advise a re-think. What's the current arrangement for supplying the dishwasher & washing machine? - there's likely to be a lot of diversity to be had there which might not be apparent. A while ago there was I think a wiring matters article about ring circuits that demonstrated the load from a typical kitchen appliances over some hours and how the 20A cable wasn't overloaded for long periods.


   - Andy.

Thanks for the inputs Andy, what risks exist if all of the power sockets in that room are powered by the power supply from the new building?

I will also provide a big red rotary isolator with clear labels to indicate its purpose to provide safety isolation; though I guess that doesnt talk about the earth standing earth leakage - how do I address that?


Existing sockets are part of a ring for the power sockets for the whole house which is shared by several appliances including a massive boiler.


Adding these extra appliances will far exceed the rating for the power supply and the building has concrete floors with tiles on them and brick walls with no insulation. It is also 3 rooms away from the consumer unit which makes it much more effort intensive to run a new circuit to it.


I have run an 8 week energy monitoring exercise to examine demand and can conclude I would have no way of running the additional appliances without a new circuit.


This is an old property which is a large house and to give you an idea of how insane the power usage is they use an approx. 30,000 kWh of power each year just from the detached house and garage.....

AJJewsbury:

Is something I am doing here not allowed?

I don't think it's completely prohibited, but you're certainly skating on very thin ice.

 

Can I just get electricity supply from the outhouse to Building B and extend and use the earth of sockets already in Building B?

In principle yes, but there are some very significant practical problems. How would isolation of building B work if an earth fault (or just standing earth leakage) could energise building B's earthing system from building A's supply? How would you satisfy the requirement for c.p.c.s within cable to be earthed in the same installation as the associated protective device, or where an overcurrent device is used for fault protection that the protective conductor be incorporated into the same wiring system as the live conductors or their immediate proximity?


I'd advise a re-think. What's the current arrangement for supplying the dishwasher & washing machine? - there's likely to be a lot of diversity to be had there which might not be apparent. A while ago there was I think a wiring matters article about ring circuits that demonstrated the load from a typical kitchen appliances over some hours and how the 20A cable wasn't overloaded for long periods.


   - Andy.

Thanks for the inputs Andy, what risks exist if all of the power sockets in that room are powered by the power supply from the new building?

I will also provide a big red rotary isolator with clear labels to indicate its purpose to provide safety isolation; though I guess that doesnt talk about the earth standing earth leakage - how do I address that?


Existing sockets are part of a ring for the power sockets for the whole house which is shared by several appliances including a massive boiler.


Adding these extra appliances will far exceed the rating for the power supply and the building has concrete floors with tiles on them and brick walls with no insulation. It is also 3 rooms away from the consumer unit which makes it much more effort intensive to run a new circuit to it.


I have run an 8 week energy monitoring exercise to examine demand and can conclude I would have no way of running the additional appliances without a new circuit.


This is an old property which is a large house and to give you an idea of how insane the power usage is they use an approx. 30,000 kWh of power each year just from the detached house and garage.....