hob and oven
- Thread starter panny300
- Start date
Will that not leave the 2kW oven with an incorrect fuse rating?
Not if he terminates a socket on the end of the cable leaving the connection point.
lost me,just wanted to know how to connect cooker and hob to existing 6mm cable,as i understand it the 6mm is rated around 46 amps as long as it dos'nt go through insulation and no volt drop.
could the 30 amp fuse be changed to 40 amp?
could the 30 amp fuse be changed to 40 amp?
OK, my take on it this (but be prepared for corrections from professional electricians). Your load is around 35A max, though a small allowance for diversity would allow you to stick with a 30A fuse. (This can be one source of argument as on a new cooker circuit most electricians try to avoid using diversity.)
Secondly, unless the cable is 'clipped direct' for its whole length you should not change the fuse.
Thirdly you should use the dual connection unit which luminare pointed at, following the cooker switch.
Forthly you should use 4 sq mm cable from there to the 2kW unit (in free air) so that the cable is protected by the 30A fuse. This requires the appliance to be prepared to accept that size cable.
If the 2kW unit has a plug already fitted then the 4mm cable runs to a 13A socket.
Secondly, unless the cable is 'clipped direct' for its whole length you should not change the fuse.
Thirdly you should use the dual connection unit which luminare pointed at, following the cooker switch.
Forthly you should use 4 sq mm cable from there to the 2kW unit (in free air) so that the cable is protected by the 30A fuse. This requires the appliance to be prepared to accept that size cable.
If the 2kW unit has a plug already fitted then the 4mm cable runs to a 13A socket.
diversity is not applied to the circuit protective device, it's applied to the whole installation for design current..
the odds of every heating element being on at the same time for a cooker and hob will be fairly small, however it does happen from time to time, at which point an undersized fuse or breaker will blow / trip..
the odds of every heating element being on at the same time for a cooker and hob will be fairly small, however it does happen from time to time, at which point an undersized fuse or breaker will blow / trip..
Well I said it would cause a row!
That's not how I read the On-Site Guide. It has separate paragraphs for assumed load for a circuit, and assumed load for a circuit feeding several circuits.Protective devices and cables alike integrate power over several minutes, which is why diversity is allowable. Still, I'd welcome other views!
If the 2kW oven has a fitted plug and a socket is wired from the connection point then 2.5mm t&e would be more than adequate though even 1.5mm t&e may suffice.
Diversity can be applied to a circuit, there are tables in the OSG for typical circuits and the diversity factor to be applied. This will determine the rating of the circuit protective device.
Have a look at 433.2.2, if compliance with (i) is met then there's no requirement for the maximum of three meters ruling.
i've never read it as that.. although I must admit to not doing domestic on a regular basis, so it doesn't come up so much for me..
if it's a 40A cooker then it has to go on a 40A ( min ) breaker and be wired with a cable capable of taking 40A continuous..
the diversity is to account for the fact that not every breaker in a board will be loaded to maximum capacity at the same time, otherwise your 80A cutout fuse would be too small with just 2 socket circuits and 3 lighting circuits..
if it's a 40A cooker then it has to go on a 40A ( min ) breaker and be wired with a cable capable of taking 40A continuous..
the diversity is to account for the fact that not every breaker in a board will be loaded to maximum capacity at the same time, otherwise your 80A cutout fuse would be too small with just 2 socket circuits and 3 lighting circuits..
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