Hello there,
My existing cooker installation is a New World double oven 5kW, an isolation switch on about 10m of 6mm (I think) cable, plus a gas hob.
I plan to buy and install a Neff Induction hob (7.2 kW max rating) and a Neff double oven, (6.8 kW max rating).
I'll be installing them in new locations (i.e. I'm moving the kitchen).
I need to know if the exiting 6mm cable is large enough to supply the new loads.
I'm not clear how the regulations on diversity work.
I've read an exiting post; "symphonysteve, 20-Aug-2006" which covers a similar instalation, but it's conclutions are far from definative.
My max total current draw would be around 60A, and the above post suggest two methods using diversity;
A) Taking 10A + 30% of the combined load would give a load current of 25A
i.e. Load current = 10A + 0.3(60A - 10A) = 25A, (30A if I opt for a socket on the isolation switch)
B) Taking 10A + 30% of each load and adding them would give a load current of 31.5A
i.e. Load current = (10A + 0.3(31.3A - 10A)) + (10A + 0.3(29.6A - 10A)) = 16.4A + 15.9A = 32.3A, (42.3A if I opted for sockets in each isolation switch)
Both seem to be well inside the 6mm cable rating of 47A, and the run is only about 4m from the MCB.
Because of the oven and hob locations I will need to install seperate isolation switches, but I was planing to spur the hob switch from the oven switch.
I can utalise the existing 6mm cable to run to the new oven isolation switch (only 4m), then take a spur to the hob isolation switch (a further 6m).
Thus both the hob and oven currents would only pass through the initial 4m of cable.
Are there more prescriptive regulations on the use of diversity?
Also, both positions are against block walls so the cables will need to be sunk into the walls above the switches.
I can't sink them 50mm, so will I need to run them through steel condutes, or will PVC be OK?
(The regs are a bit uncleare on this and seem to suggest only if a socket is included on the switch. I don't need sockets on either isolation switch).
Thanks
My existing cooker installation is a New World double oven 5kW, an isolation switch on about 10m of 6mm (I think) cable, plus a gas hob.
I plan to buy and install a Neff Induction hob (7.2 kW max rating) and a Neff double oven, (6.8 kW max rating).
I'll be installing them in new locations (i.e. I'm moving the kitchen).
I need to know if the exiting 6mm cable is large enough to supply the new loads.
I'm not clear how the regulations on diversity work.
I've read an exiting post; "symphonysteve, 20-Aug-2006" which covers a similar instalation, but it's conclutions are far from definative.
My max total current draw would be around 60A, and the above post suggest two methods using diversity;
A) Taking 10A + 30% of the combined load would give a load current of 25A
i.e. Load current = 10A + 0.3(60A - 10A) = 25A, (30A if I opt for a socket on the isolation switch)
B) Taking 10A + 30% of each load and adding them would give a load current of 31.5A
i.e. Load current = (10A + 0.3(31.3A - 10A)) + (10A + 0.3(29.6A - 10A)) = 16.4A + 15.9A = 32.3A, (42.3A if I opted for sockets in each isolation switch)
Both seem to be well inside the 6mm cable rating of 47A, and the run is only about 4m from the MCB.
Because of the oven and hob locations I will need to install seperate isolation switches, but I was planing to spur the hob switch from the oven switch.
I can utalise the existing 6mm cable to run to the new oven isolation switch (only 4m), then take a spur to the hob isolation switch (a further 6m).
Thus both the hob and oven currents would only pass through the initial 4m of cable.
Are there more prescriptive regulations on the use of diversity?
Also, both positions are against block walls so the cables will need to be sunk into the walls above the switches.
I can't sink them 50mm, so will I need to run them through steel condutes, or will PVC be OK?
(The regs are a bit uncleare on this and seem to suggest only if a socket is included on the switch. I don't need sockets on either isolation switch).
Thanks
Last edited: