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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Power & fuse rating
Hi,
We are currently having our kitchen put in with a built in electric oven. The power consumption stated in the the oven literature is 3.6KW yet our builder keeps insisting that a 13A switched fuse spur socket should be fine. I have tried explaining to him that with a 13A fuse the maximum power it can handle is 3120W. He says that he has installed many electric (Fan assisted) ovens and even bigger ones than ours and he always uses a 13A switched fuse spur socket? Surely from the basic formula, P = I * V the required fuse for the oven would be around 15A or am I missing something here? |
#2
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Power & fuse rating
M.Joshi wrote: Hi, We are currently having our kitchen put in with a built in electric oven. The power consumption stated in the the oven literature is 3.6KW yet our builder keeps insisting that a 13A switched fuse spur socket should be fine. I have tried explaining to him that with a 13A fuse the maximum power it can handle is 3120W. He says that he has installed many electric (Fan assisted) ovens and even bigger ones than ours and he always uses a 13A switched fuse spur socket? Surely from the basic formula, P = I * V the required fuse for the oven would be around 15A or am I missing something here? -- M.Joshi Actually it's worse than that as nominal voltage is now 230V so that gives a current of 15.7A. What I would do is to install a seperate radial circuit for this using a 20A breaker on 2.5mm cable via a cooker outlet. This would comply with regs. Your builder is not complying with regs and diversity only applies with a cooker and not just an oven. Is your builder part P (building regs) registered? Has he done any kind of testing of the circuit he intends to add your oven onto? If he's done this with bigger ovens he's going to have a lot of disgruntled customers wondering why the fuse keeps blowing or the breaker keeps tripping whenever they put the kettle on while the oven is on. Still these guys keep us sparkies in business fixing their bodges. |
#3
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Power & fuse rating
M.Joshi writes:
Surely from the basic formula, P = I * V the required fuse for the oven would be around 15A or am I missing something here? * All these things (appliances, cookers, fuses, breakers) have a fair tolerance. The mains voltage can be a few percent out too. Though fuses and breakers will carry their rated load continuously and probably a bit more. * There may not be a regulation saying you can't but what if the cooker's manual did say that it must be on its own circuit, the cooker were to burst into flames one day and burn your house down (because of a fault rather than the way you wired it) and the insurance company found out. Jon |
#4
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Power & fuse rating
In article ,
M.Joshi wrote: We are currently having our kitchen put in with a built in electric oven. The power consumption stated in the the oven literature is 3.6KW yet our builder keeps insisting that a 13A switched fuse spur socket should be fine. If it is suitable for effectively running off a 13 amp supply it will come with a fitted 13 amp lead and plug. -- *What was the best thing before sliced bread? * Dave Plowman London SW To e-mail, change noise into sound. |
#5
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Power & fuse rating
M.Joshi wrote:
Hi, We are currently having our kitchen put in with a built in electric oven. The power consumption stated in the the oven literature is 3.6KW yet our builder keeps insisting that a 13A switched fuse spur socket should be fine. I have tried explaining to him that with a 13A fuse the maximum power it can handle is 3120W. He says that he has installed many electric (Fan assisted) ovens and even bigger ones than ours and he always uses a 13A switched fuse spur socket? Surely from the basic formula, P = I * V the required fuse for the oven would be around 15A or am I missing something here? Physically one can run that on a 13A plug, we used to have 15A loads on 13A plugs, but it should not be done, and you as a customer have a right to expect a legal compliant installation, and to insist on such. Also some makes of plug wont handle that current, and will end up melting down. Given his response I'd be keeping a good eye on the whole proceedings. NT |
#6
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Power & fuse rating
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