I am currently having a new kitchen fitted and although it is costing me a arm and a leg..where I want some sockets fitting there is none existing,its not really feasible to come off the existing ring... ..... but near to where I want them there is a isolator switch / socket feeding the cooker (6mm cable ).. the new cooker will be a gas hob/ elec fan assisted oven.. my thoughts are before the kitchen gets fitted remove the old cooker and fit a junc box below the soon to be fitted base units then from the junc box run a cable round fit 4 double sockets then the return cable back to the junc box from last socket....your expert thoughts please...
Creating a ring circuit
- Thread starter JOHNBOY42
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Why run it back to the CU?
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reading the post again I don't think I explained it well ...the old electric cooker is going.. so if I swith off the electric ,cut the cable going into the old cooker so its just a tail hanging there..remove the cooker then run a ring main off that as described then the whole kitchen will have its own ring circuit
Depends on the oven. If the oven is less than 3 kw then you can do what you propose and fit a 13 amp fused connection unit for the oven.
If the oven is > 3 kW then you will need a radial circuit for the oven (which is your existing cooker circuit) and you will need a new circuit for the sockets.
It is a double oven A rated...pretty sure the main uses about 1.8 and second oven uses 0.8 there or there about..but less than 3kw
Never seen any double oven which was less than 3kW total, and it's highly implausible that such a thing would even exist.
For the circuits, either extend the existing circuit for the sockets to add more, or fit a new circuit just for the sockets.
Removing the cooker circuit is not a good idea even if the new oven can be plugged in, as at some point in the future an electric hob or different oven may be fitted which will require it.
Don't get confused between kW and kWh.
If you have an hour to spare, read this. http://www.energylens.com/articles/kw-and-kwh
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The so called lollipop method to form a ring final remote from the supply is used, there are both plus and minus points the main problem is loading the ring too close to its origin with any ring can cause an overload without it tripping the MCB. Using a double cooker connection unit there should be enough room to fit both ends of ring and a spur to the oven which would likely remove the overload problem. At 32A clearly the MCB will trip stopping a general overload but 2.5mm² cable is rated somewhere around the 20A mark depending how it is installed. At the centre of the ring a 32A load would be even 16A on each leg, but at near the origin it can be 1A and 31A split. If the 2kW recommended limit for fixed appliances is followed then it is unlikely any overload will occur for long enough to overheat the cable. But your oven likely exceeds the 2kW recommended limit.
If you take two 2.5mm² cables all the way from the consumer unit even having a tumble drier, washing machine, dishwasher, and oven on the same ring likely the draw on each leg will be reasonably even so you will not get over 20A on either leg without tripping the 32A breaker (Unless consumer unit in kitchen) but with the lollipop method this is not the case. There has been discussion as to if the lollipop method complies with BS7671:2008 as a result.
In Wales where I live it would be notifiable under the Part P building regulation and it costs so much to register direct there is only really one legal way, and that is use a scheme member electrician who should take all I have said into account, however England removed kitchens from the special locations list.
If you take two 2.5mm² cables all the way from the consumer unit even having a tumble drier, washing machine, dishwasher, and oven on the same ring likely the draw on each leg will be reasonably even so you will not get over 20A on either leg without tripping the 32A breaker (Unless consumer unit in kitchen) but with the lollipop method this is not the case. There has been discussion as to if the lollipop method complies with BS7671:2008 as a result.
In Wales where I live it would be notifiable under the Part P building regulation and it costs so much to register direct there is only really one legal way, and that is use a scheme member electrician who should take all I have said into account, however England removed kitchens from the special locations list.
Guys...thanks for all the advice but as flameport said I may get a electric hob in future so I am really best leaving the cooker feed alone... I will have to come off the ring main and although it involves a bit of work...chasing out lifting floorboards it will be best in the end....... or maybe even supply its own ring ..I will lift the floorboards up to see .. once again thanks
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