I am having difficulty getting correct details to fit an electric oven and induction hob. First off the manufacturer's details are a little confusing and I am uncertain of the acceptable load to carry on existing cables.
For starters the excising cooker is on its own circuit with a 32A MCB. The existing gas hob (just for the ignition) is on the kitchen ring circuit, again with a 32A MCB. The appliances have the following ratings:
Hob - 8.5kW (using all plates and with two boosted for rapid warm up)
Cooker Oven/Grill - 3.0kW/3.0kW, hence 6.0kw in total (although connected load is stated as 3.0kW)
The hob I accept is taking a large load and will therefore need to be treated carefully. However, the oven I believe will never exceed 3.0kW as the oven and hob are only ever used independently. Using this argument the MCB rating should be 12.5A I believe. If this were correct I think this would be okay on the ring circuit as this already as a rating of 32A. This will also allow the kettle and microwave to be used also, without tripping the MCB. However, my concern here is that the standard 2.5mm cable may not be able to cope with the load.
Assuming the cooker can be dealt with this way, I wished to then attach the hob to the existing cooker circuit and increase the MCB to compensate for the increased load. A MCB rated at 40A should be suitable I thought. However, again I am unsure if the cable at 6mm can take the load.
At the end of the day I wish to make use of existing cabling, as whilst I have plenty of capacity in the consumer unit for more circuits, laying new cable is out of the question. The only other possible option I can come up with is the use of 10mm cable to replace the 6mm cable, assuming I can get this through the existing trunking, and attach both appliances to the cooker circuit with the appropriate MCB, i.e. rated at the next option above 40A
Advise on the above would be greatly received.
For starters the excising cooker is on its own circuit with a 32A MCB. The existing gas hob (just for the ignition) is on the kitchen ring circuit, again with a 32A MCB. The appliances have the following ratings:
Hob - 8.5kW (using all plates and with two boosted for rapid warm up)
Cooker Oven/Grill - 3.0kW/3.0kW, hence 6.0kw in total (although connected load is stated as 3.0kW)
The hob I accept is taking a large load and will therefore need to be treated carefully. However, the oven I believe will never exceed 3.0kW as the oven and hob are only ever used independently. Using this argument the MCB rating should be 12.5A I believe. If this were correct I think this would be okay on the ring circuit as this already as a rating of 32A. This will also allow the kettle and microwave to be used also, without tripping the MCB. However, my concern here is that the standard 2.5mm cable may not be able to cope with the load.
Assuming the cooker can be dealt with this way, I wished to then attach the hob to the existing cooker circuit and increase the MCB to compensate for the increased load. A MCB rated at 40A should be suitable I thought. However, again I am unsure if the cable at 6mm can take the load.
At the end of the day I wish to make use of existing cabling, as whilst I have plenty of capacity in the consumer unit for more circuits, laying new cable is out of the question. The only other possible option I can come up with is the use of 10mm cable to replace the 6mm cable, assuming I can get this through the existing trunking, and attach both appliances to the cooker circuit with the appropriate MCB, i.e. rated at the next option above 40A
Advise on the above would be greatly received.
