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[R791345]

My friend wants to lower the heat in an electric oven for yeast rising. He wishes to run it at 35C which is too low for the oven's built in thermocouple. He has bought a 30A digital thermometer (DT) which has its own theremocouple and proposes to make an extension lead which contains the DT as follows:

Connect the DT to a DP single gang socket and plug oven lead into socket..
Connect the supply to a 3 pin 13A plug to the cooker's existing mains supply (a 2 gang socket).

He wonders about the following:

What diameter cable should he use for the extension lead? The Oven runs at 10.75A 240v (there is no surge over 10.75A when the oven is turned on).
Why is the mains supply at over 30A when the oven only needs 10.75. There are no electric hobbs. The mains supply is probably 6mm cable to the wall socket, but as there is no electric hob is that not too high for this oven?


Is it sensible to have an RCD in the extension or just unnecessary expense?


R

PS. I am new here and could not find a way to post into the DIY conference as it is locked to me, so I posted to this one which to me is most likely to have the expertise to give a considered reply.

 

[Sintra]

I have moved this into the DIY forum and given you permissions to post.

 

[markc123]

My friend wants to lower the heat in an electric oven for yeast rising. He wishes to run it at 35C which is too low for the oven's built in thermocouple. He has bought a 30A digital thermometer (DT) which has its own theremocouple and proposes to make an extension lead which contains the DT as follows:

Connect the DT to a DP single gang socket and plug oven lead into socket..
Connect the supply to a 3 pin 13A plug to the cooker's existing mains supply (a 2 gang socket).

He wonders about the following:

What diameter cable should he use for the extension lead? The Oven runs at 10.75A 240v (there is no surge over 10.75A when the oven is turned on).
Why is the mains supply at over 30A when the oven only needs 10.75. There are no electric hobbs. The mains supply is probably 6mm cable to the wall socket, but as there is no electric hob is that not too high for this oven?


Is it sensible to have an RCD in the extension or just unnecessary expense?


R

PS. I am new here and could not find a way to post into the DIY conference as it is locked to me, so I posted to this one which to me is most likely to have the expertise to give a considered reply.

Firstly what you're suggesting to do sounds like a dogs dinner.

Secondly, the reason it's like that is because whats to say before you there was a 15kW oven...or after you for that matter. Cooker's up to 15kW are wired in 6mm off a 32A breaker, it's the standard what everyone works too.

Is it just a double socket behind the cooker? No isolation anywhere? What is the socket wired in? Yes...6mm cable and a 32A breaker for something plugged in on a 13A fuse isn't correct, however you won't find many putting sockets behind cookers theses days without isolation.

And another thing, good luck on getting a 6mm cable onto a 13a plug. lol.

 

[Deleted member 9648]

If you are simply plugging this oven in to a 13a socket via a 13a fused plug with an in-line D/T 1.5mm flex will suffice which is rated at 16a.