Z
Ziggy1979
Hi everyone
I'm not a spark so please be gentle!
We're building an extension and I was planning on doing the electrics. The bedrooms are just an extension of the existing ring mains (upstairs one and downstairs one) adding a few sockets in each room (no Spurs).
I've notified building control and they've told me Im ok to do the work but I have to pay an additional fee to a "company" that will check everything once I'm done. This we are doing.
My main questions are for the kitchen/utility room. I'd planned the following:
1. New RCD protected ring main in 2.5mm T&E on 32A MCB serving utility/kitchen. This would take washer, dryer, dishwasher, extractor hood and above worktop sockets.
2. New non RCD protected radial on 16A MCB (or 20A?) in 2.5mm T&E serving ONLY 2 x fridge freezers (180W and 300W).
3. New RCD protected radial in 6mm T&E on 40A MCB serving 10.8kW induction hob. Can or should I use a 45A DP cooker switch with this?
4. New RCD protected radial in 2.5mm T&E on 20A MCB serving 3.8kW single oven. This is the one I'm most unsure about. Originally I thought to use 6mm. My thinking is the following: The cable run is 6-8 metres max. It will go in conduit behind plaster on a block wall which derates 2.5mm to 23A. It then goes to a 20A DP switch and then to a single 13A socket or cooker connection unit (some of the ovens we've looked at need hardwiring others had a plug). Oven is 3800/230 = 16.5A.
Thank you all for your help and for all the previous posts that have helped me to no end!
Zigs
I'm not a spark so please be gentle!
We're building an extension and I was planning on doing the electrics. The bedrooms are just an extension of the existing ring mains (upstairs one and downstairs one) adding a few sockets in each room (no Spurs).
I've notified building control and they've told me Im ok to do the work but I have to pay an additional fee to a "company" that will check everything once I'm done. This we are doing.
My main questions are for the kitchen/utility room. I'd planned the following:
1. New RCD protected ring main in 2.5mm T&E on 32A MCB serving utility/kitchen. This would take washer, dryer, dishwasher, extractor hood and above worktop sockets.
2. New non RCD protected radial on 16A MCB (or 20A?) in 2.5mm T&E serving ONLY 2 x fridge freezers (180W and 300W).
3. New RCD protected radial in 6mm T&E on 40A MCB serving 10.8kW induction hob. Can or should I use a 45A DP cooker switch with this?
4. New RCD protected radial in 2.5mm T&E on 20A MCB serving 3.8kW single oven. This is the one I'm most unsure about. Originally I thought to use 6mm. My thinking is the following: The cable run is 6-8 metres max. It will go in conduit behind plaster on a block wall which derates 2.5mm to 23A. It then goes to a 20A DP switch and then to a single 13A socket or cooker connection unit (some of the ovens we've looked at need hardwiring others had a plug). Oven is 3800/230 = 16.5A.
Thank you all for your help and for all the previous posts that have helped me to no end!
Zigs
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