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Wow thanks for quick reply! Do you think it wold be wise if some of the mains ring circuits had small enough load I could use 20a rated device i.e. upstairs bedroom ring ( 2 beds) and CH pump and heating control ring? That is with max power ratings taken into consideration.

When designing a circuit is their any advantage or disadvantage in creating more mains ring circuits than necessay. For example, putting the kitchen on seperate circuit, living room on seperate circuit and bedrooms on seperate circuit. Would it be wise to putpumps and heating controls on...

Sorry forgot to mention cooker circuit, suppose 40 amps.

How realistic is 16kw consumption for a 1 1/2 bed granny flat assuming 3 ring mains 2 lighting circuits. Small kitchen with electric cooker and tumble dryer washing machine etc. Gas CH and HW. To calculate power consumption in this case do I just add up all my KW ratings of all appliances...

perhaps I should re -categorize this as a power consumption query rather than a cable sizing query.

I am looking at running a seperat sub metered consumer unit in a granny flat. Ive found a cable size calculator on the TLC electrical supplies page here...

Great, getting the picture now. So the way I see it, Henley blocks from after meter to a 63 or 100 amp slow rcd and fuse. (to be done by electrician) 25 mm split concentric cable- Will this need an earth if the Flat CU has its own seperate earth? into 100 amp moulded isolator...

The BC love me and on board. Ok cooker circuit 25a two lighting circuits on 5amp circuits total 1000 w two ring mains on 32 amp circuits with living room and kitchen, i.e TV video , Washing machine, kettle, heating pump, shower fan, dishwasher and tumble dryer. Gas heating and HW. Is...

I should add that the original house CU is next to the meter. The flat has gas heating and water, but will use an electric cooker.

I have built an extension which incorperates a seperate'granny' flat. I have wired the lighting and mains circuit and now wish to connect it all up at the consumer unit. My intention is to connect this consumer unit to the original house consumer unit using armoured cable (twin cored) It will...

I dont know wether this is helpful but Ive just ordered a handmade staircase. Its made with MDf and pine and does not include spindles and bannisters. It goes up 15 steps or risers and turns on itself 180 degrees. It has 6 winders (the steps that make up the turn) I think I got a cheap price of...