Sorry, this might be a bit of a tired subject...
I have just bought a replacement double oven and I'm trying to work out what I need to do about the supply.
The existing circuit is 2.5mm T+E radial on a 20A breaker and the new oven is rated at 5.9kW. That is a 25.7A load so I'll need a 32A MCB. I'm assuming that diversity is not applicable here because it's entirely likely that both oven elements will be on continuously and simultaneously when they are turned on from cold.
The cable route to the cooker switch is approx. 2m through galvanised trunking, 7m through a floor space/clipped to wall and 200mm buried behind tiles (tile singular really). 4mm T+E with method B for the trunking can supply 30A - correct?
Can I install a 32A MCB on a cable rated at 30A for a fixed-load circuit that has no requirement for overload protection anyway? Or do I need a bigger cable?
The trunking also contains two ring finals and an underfloor heating circuit. However, if I apply a 0.65x grouping factor for 4 circuits I'm faced with a 10mm cable for the oven. Do I need to consider grouping? I can't guarantee that the other circuits won't be fully and continuously loaded at the same time as the cooker circuit, but it is rather unlikely.
Thanks in advance!
I have just bought a replacement double oven and I'm trying to work out what I need to do about the supply.
The existing circuit is 2.5mm T+E radial on a 20A breaker and the new oven is rated at 5.9kW. That is a 25.7A load so I'll need a 32A MCB. I'm assuming that diversity is not applicable here because it's entirely likely that both oven elements will be on continuously and simultaneously when they are turned on from cold.
The cable route to the cooker switch is approx. 2m through galvanised trunking, 7m through a floor space/clipped to wall and 200mm buried behind tiles (tile singular really). 4mm T+E with method B for the trunking can supply 30A - correct?
Can I install a 32A MCB on a cable rated at 30A for a fixed-load circuit that has no requirement for overload protection anyway? Or do I need a bigger cable?
The trunking also contains two ring finals and an underfloor heating circuit. However, if I apply a 0.65x grouping factor for 4 circuits I'm faced with a 10mm cable for the oven. Do I need to consider grouping? I can't guarantee that the other circuits won't be fully and continuously loaded at the same time as the cooker circuit, but it is rather unlikely.
Thanks in advance!