Hi folks. I have a friendly electrician mate who has a bit of a reputation for over engineering so I want to confirm the advice before I spend a small fortune.
I want to add a circuit to an existing (new) domestic CU which has a 100A supply. The CU currently powers a granny annex so the load is small. The new circuit will be for a garage 100m away. I need to run SWA underground across the garden.
From the new garage, I also need to then run a circuit to a greenhouse and games room, again underground across the garden which is a further 70m away.
The garage will likely only power basic diy tools, power washer, lighting circuit, electric car charger (requires own 20A circuit), nothing major, ie no arc welding! Games room may have a heater, power and lighting only so again, small ish load.
I asked for a specification that would suit and leave room to grow in the future.
My mate has specified a 32A supply from the annex CU to a 4way garage CU using 25mm SWA followed by a 16A supply from the garage to the games room again using 25mm SWA.
What I'd really like is a second opinion on this one as he originally specified 16mm SWA then changed his mind, so I'm felling a little unconvinced.
Can anyone help please? I've tried various calculators which seem to indicate 10mm or 16mm SWA would be fine, but I'm not totally clear on the calculator inputs so I don't want to get it wrong.
Can anyone categorically state what I need please?
Thanks very much
I want to add a circuit to an existing (new) domestic CU which has a 100A supply. The CU currently powers a granny annex so the load is small. The new circuit will be for a garage 100m away. I need to run SWA underground across the garden.
From the new garage, I also need to then run a circuit to a greenhouse and games room, again underground across the garden which is a further 70m away.
The garage will likely only power basic diy tools, power washer, lighting circuit, electric car charger (requires own 20A circuit), nothing major, ie no arc welding! Games room may have a heater, power and lighting only so again, small ish load.
I asked for a specification that would suit and leave room to grow in the future.
My mate has specified a 32A supply from the annex CU to a 4way garage CU using 25mm SWA followed by a 16A supply from the garage to the games room again using 25mm SWA.
What I'd really like is a second opinion on this one as he originally specified 16mm SWA then changed his mind, so I'm felling a little unconvinced.
Can anyone help please? I've tried various calculators which seem to indicate 10mm or 16mm SWA would be fine, but I'm not totally clear on the calculator inputs so I don't want to get it wrong.
Can anyone categorically state what I need please?
Thanks very much