A normal kettle (or two plugged into a double socket) don't take 40 mins to get up to temperature though.
If it is blowing 13a fuses then a 16a RCBO probably won't be mush use
Yes, I think JohnW2's idea of a 20amp might be more appropriate
A normal kettle (or two plugged into a double socket) don't take 40 mins to get up to temperature though.
If it is blowing 13a fuses then a 16a RCBO probably won't be mush use
My view as well, usually running the cable is the biggest part of a radial job in a decorative environment so might as well leave a bit of spare capacity for the future.I wouldn't bother with 2.5mm cable, bigger is better for when it needs upgraded.
You're welcome. I'm actually far from convinced that 15A would blow a 13A fuse ever (i.e. no matter how long the 15A flowed). If it were a 13A Type B MCB, rather than a fuse, it would carry about 14.7A (+13%) indefinitely and about 18.9A (+45%) for about an hour. I think BS1362 fuses (as in plugs and FCUs) are 'worse' ('more tolerant') than that, so a 13A one may well carry 15A 'indefinitely' and 20A+ for an hour or so (and perhaps even higher currents for shorter periods) - I need to look up the operating characteristics of those fuses!Big brakes on.....I followed up the suggestion that 15 amps or so would not necessarily blow a 13amp fuse for a short time (thanks JohnW2).
As you say, if that's a possibility you need a 32A dedicated circuit in 4mm² (or maybe even 6mm²) cable. If you haven't got one, is there any possibility that you could beg, borrow or steal a clamp meter to determine how much current this DW is actually drawing?... they said (news) that some earlier models were fitted with a 6kW single phase element and that was not in the current range and not in the documentation they sent to me. Definitely not final ring circuit 2.5mmT&E stuff. If it is a 6kw heater then that would blow a 13amp fuse quickly and yet not trip the 32amp ring protection. The dishwasher works fine but now disabled until a new radial service is in place with a 32amp rcbo protected 4mm T&E dedicated supply, might even go to 6mm.
Unfortunately, it seems that the OP probably does not have documentation relevant to that question ...Just wondering, do you have the circuit diagram for the unit? In my experience, it would be slightly strange to have a single 6kw heater in a unit that is designed for 3 phase.
I questioned the manufacturer again about the fuse blowing and they said (news) that some earlier models were fitted with a 6kW single phase element and that was not in the current range and not in the documentation they sent to me.
How come you're not aware of fuse characteristics, time-current curves etc?I followed up the suggestion that 15 amps or so would not necessarily blow a 13amp fuse for a short time
Whatever his answer to that, I can also join the club (I don't necessarily keep such information in my head!) ...How come you're not aware of fuse characteristics, time-current curves etc?
- I need to look up the operating characteristics of those fuses!
... just as it 'seems to be a novel idea' to very many people. I'm not really sure why you were asking the OP why he was not one one them (particularly given that there is no real answer to a question like that!)!What I meant was that the whole idea that a 13A fuse might not blow as soon as you put more than 13A through it seemed a novel one to him.
I'm thinking that I may need to run a radial cable to serve the dishwasher.
Very probably, but a statement about that might have been more appropriate than 'beating about the bush' with a question to which there couldn't really be a useful answer ("How come you don't know X?")!is it because the OP was writing as if he was intending to install a new circuit in a public building?
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