Two plug in ovens

[endecotp]

What size is the current wiring?

I would probably use the same size for the new bits, just to keep it obvious what's going on for anyone who looks in the future - or if maybe someone ever wants to replace one of these 13A ovens with a 16A one.

 

[EFLImpudence]

Oh dear.

 

[sparkwright]

I thought the fuse protected the flex, not the T&E? Wouldn't I need FCUs to make sure the 2.5mm doesn't overload and the 32 MCB not trip? (Talking to meet regs, I wouldn't be plugging anything other than the two ovens in.)

The fuse in the plug protects the flex coming out of the plug.
The 6mm2 cable forming the cooker circuit, and little bit of 2.5mm2 between the two sockets, is protected by typically a fuse or mcb or rcbo at the consumer unit - usually 30 or 32 amp.
If you're worried about the piece of 2.5mm2 cable, it's fine.
For example, a typical ring circuit for sockets is rated at 30 or 32 amp, yet you can spur off it, using 2.5mm2, can't you?
Since you are only plugging something no greater than 13 amp into that single socket, that piece of 2.5mm2 is actually capable of carrying around 26 amp.

 

[Damo3716]

The fuse in the plug protects the flex coming out of the plug.
The 6mm2 cable forming the cooker circuit, and little bit of 2.5mm2 between the two sockets, is protected by typically a fuse or mcb or rcbo at the consumer unit - usually 30 or 32 amp.
If you're worried about the piece of 2.5mm2 cable, it's fine.
For example, a typical ring circuit for sockets is rated at 30 or 32 amp, yet you can spur off it, using 2.5mm2, can't you?
Since you are only plugging something no greater than 13 amp into that single socket, that piece of 2.5mm2 is actually capable of carrying around 26 amp.

And that would still be OK with two ovens running? Would it need two spurs or would two sockets on a single run of 2.5mm be OK?

 

[sparkwright]

Assuming you have a 6mm2 circuit with a 30 or 32 amp protective device, you would run 6mm2 to the first socket, then from there 2.5mm2 to the second socket.

OR, 6mm2 to a 30 amp junction box, and one 2.5mm2 from jb to first socket,
another 2.5mm2 from jb to second socket.

OR just do all in 6mm2 if you prefer.

Where I have written 6mm2, 4mm2 is also likely to be an option, if protected at 30 or 32 amp.

 

[Damo3716]

Assuming you have a 6mm2 circuit with a 30 or 32 amp protective device, you would run 6mm2 to the first socket, then from there 2.5mm2 to the second socket.

OR, 6mm2 to a 30 amp junction box, and one 2.5mm2 from jb to first socket,
another 2.5mm2 from jb to second socket.

OR just do all in 6mm2 if you prefer.

Where I have written 6mm2, 4mm2 is also likely to be an option, if protected at 30 or 32 amp.

Thank you. That all makes sense now.

 

[EFLImpudence]

Assuming you have a 6mm2 circuit with a 30 or 32 amp protective device, you would run 6mm2 to the first socket, then from there 2.5mm2 to the second socket.

No, the fuse will protect all the cables against overload which, by the way, ovens cannot cause.
The protective device does not have to be at the beginning of the circuit.

Also, the 32A will protect all the cables against fault current - it just will.

OR, 6mm2 to a 30 amp junction box, and one 2.5mm2 from jb to first socket,
another 2.5mm2 from jb to second socket.

You just stated that 2.5mm² is satisfactory for spurs off a 32A ring circuit - so why not on a cooker circuit?

OR just do all in 6mm2 if you prefer.

Not necessary.
6mm² is even too big for the cooker circuit.

Where I have written 6mm2, 4mm2 is also likely to be an option, if protected at 30 or 32 amp.

Exactly.

So why not 26A (two 13A fuses) for 2.5mm²?

 

[sparkwright]

No, the fuse will protect all the cables against overload which, by the way, ovens cannot cause.
The protective device does not have to be at the beginning of the circuit.

Fair enough.

Also, the 32A will protect all the cables against fault current - it just will.

Fair enough.

You just stated that 2.5mm² is satisfactory for spurs off a 32A ring circuit - so why not on a cooker circuit?

I haven't stated that spurs in 2.5mm2 is unsatisfactory on a cooker circuit.

Not necessary.
6mm² is even too big for the cooker circuit.

Written 6mm2 because it's the commonest size of cable used for cooker circuits. Also wanted to avoid writing 'or 4mm2' every time because it's monotonous.

Exactly.

Exactly.

So why not 26A (two 13A fuses) for 2.5mm²?

If you mean running a 2.5mm2 to first socket, then another 2.5mm2 from first socket to second socket - only because you wouldn't do that on a 30 or 32 amp ring circuit.
(Although, back in the day, it was acceptable to spur from the ring with a single socket, and then spur from that one to another single socket, all in 2.5mm2.)
But point taken - it's no different than spurring from a ring circuit at the consumer unit with a double socket.

 

[Damo3716]

Fair enough.


Fair enough.

I haven't stated that spurs in 2.5mm2 is unsatisfactory on a cooker circuit.

Written 6mm2 because it's the commonest size of cable used for cooker circuits. Also wanted to avoid writing 'or 4mm2' every time because it's monotonous.

Exactly.

If you mean running a 2.5mm2 to first socket, then another 2.5mm2 from first socket to second socket - only because you wouldn't do that on a 30 or 32 amp ring circuit.
(Although, back in the day, it was acceptable to spur from the ring with a single socket, and then spur from that one to another single socket, all in 2.5mm2.)
But point taken - it's no different than spurring from a ring circuit at the consumer unit with a double socket.

Thanks for hashing this of guys. Is there a common concensus in the simplest way that's both safe and within regs?

 

[EFLImpudence]

Is there a common concensus in the simplest way that's both safe and within regs?

As you can see, there is not.

People have their own preferences; all within the regulations.

Your own original suggestion is within the regulations but I think it untidy as I like all cooking appliance to be controlled by the cooker switch on the cooker circuit.
Others think you should do things so that they are clear to future idiots or in case someone wants to connect a hadron collider one day.

Obviously I would do it as I have suggested.

So, it is up to you.

 

[flameport]

in the simplest way

Extend the circuit using the same size cable as is used for the existing part of it as many socket outlets as required.