Induction hob plus oven wiring - rating?

[Bobster]

So please no more sarky comments. I will be using an electrician to do the work - I'm not doing this myself. I'm just planning it at this stage because I want to know if the existing circuit is adequate for the load. Any questions?

Well, we've never heard that before haha.

 

[telectrix]

Are you reading this thread? It's stranded with a yellow/green PVC cover.

6.0mm is generally a solid cpc (earth core). 10.0mm is stranded. however, it could be imperial cable, 7/036 or 7/044. sorry to add to the confusion.

 

[Taylortwocities]

What's your point here - are you referring to me or what?

Yes, I was referring to you. There is no positive and negative in AC circuitry. Well there is, if you look at an AC sine wave.

But my point is that if you are thinking black is -ve and red is +ve, then you need to concentrate on other aspects of DIY than Electricity.

Sorry to be hard, but trying to stop you getting out of your depth.

 

[les24preludes]

Ah, right. Thanks for that. I have people coming over so no time now. I'm just going on what I can see with a torch inside the insulator, which I can only get about an inch off the wall. It doesn't look like a flat T&E. There are 3 wires, all stranded PVC sheathed. OD of each is 5mm including the sheath. Looking at Farnell specs, 6mm is 4.85mm OD which looks right and 10mm is 6.3mm OD which looks too thick. But as you say, it's not T&E inside the insulator.

 

[westward10]

Can you show a pic.

 

[westward10]

6.0mm is generally a solid cpc (earth core). 10.0mm is stranded. however, it could be imperial cable, 7/036 or 7/044. sorry to add to the confusion.

Assuming metric being an 80s property.

 

[telectrix]

Ah, right. Thanks for that. I have people coming over so no time now. I'm just going on what I can see with a torch inside the insulator, which I can only get about an inch off the wall. It doesn't look like a flat T&E. There are 3 wires, all stranded PVC sheathed. OD of each is 5mm including the sheath. Looking at Farnell specs, 6mm is 4.85mm OD which looks right and 10mm is 6.3mm OD which looks too thick. But as you say, it's not T&E inside the insulator.

look on the bright side. at least you'll not be tempted into buying a gas oven and sticking your yed in it.

 

[les24preludes]

OK - I see the point about AC. Just not thinking since I build DC circuits in electronics and when I see red and black wires my head goes "pos and neg". So going back to the point of the thread
1. How do I know if this is 6mm or 10mm wiring? 10mm is fine.
2. If it's 6mm wiring, and given the travel is 7 metres from the fuse box, is this circuit Ok for 11kW? Looking into this, I came across the following calculations:
100% of first 10amps and 30% of remaining load, add 5 amps if a 13a outlet in control unit. So 11kw= 47.83amps at 230v
30% of 37.83 = 11.349
11.349+10= 21.349a
So a 6mm cable should satisfy the regs. Does this sound correct?

 

[telectrix]

OK - I see the point about AC. Just not thinking since I build DC circuits in electronics and when I see red and black wires my head goes "pos and neg". So going back to the point of the thread
1. How do I know if this is 6mm or 10mm wiring? 10mm is fine.
2. If it's 6mm wiring, and given the travel is 7 metres from the fuse box, is this circuit Ok for 11kW? Looking into this, I came across the following calculations:
100% of first 10amps and 30% of remaining load, add 5 amps if a 13a outlet in control unit. So 11kw= 47.83amps at 230v
30% of 37.83 = 11.349
11.349+10= 21.349a
So a 6mm cable should satisfy the regs. Does this sound correct?

correct. as long as the cable is not covered in insulation, 6.omm .is good for a cooker/oven circuit up to 15kW (allowing for the diversity that you mentioned). you seem to be over complicating the issue.

 

[les24preludes]

Diversity covers a multitude of sins. I was thinking of a perfect storm like a Christmas dinner with a roasting turkey and four rings on the go on an induction hob. But as you say, that's probably overthinking things. Or alternatively setting the Miele oven on self-clean at the same time as cooking up a few kilos of boiled vegetables for a vegan lunch.... That's probably seriously overthinking it.....

 

[DPG]

at the same time as cooking up a few kilos of boiled vegetables for a vegan lunch.... That's probably seriously overthinking it.....

Vegan lunch - I'd stick the cooker on a 6A MCB then to make sure it tripped out!

 

[les24preludes]

Vegan lunch - I'd stick the cooker on a 6A MCB then to make sure it tripped out!

Good thing I'm not a vegan..... I'd also imagine that the percentage of vegan electricians may be on the small side.