I need 4mm t&e to wire up an oven and am surprised that Screwfix sell
2.5mm & 6mm but not 4. Is it better to use 6mm? (Oven is 5.5KW.)

Si wrote:

I need 4mm t&e to wire up an oven and am surprised that Screwfix sell
2.5mm & 6mm but not 4. Is it better to use 6mm? (Oven is 5.5KW.)

Depending on distance and other factors, you may be able to use 2.5mm^2.

4mm^2 is not that popular partly because the earth wire (CPC) is no
bigger than in 2.5mm^2 at 1.5mm^2. Hence you often find situations were
current carrying capacity and voltage drop are fine, but you can't meet
the required disconnect times, or the earth is undersized in fault
conditions.


--
Cheers,

John.

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"Si" $3o&m wrote in message
...

I need 4mm t&e to wire up an oven and am surprised that Screwfix sell
2.5mm & 6mm but not 4. Is it better to use 6mm? (Oven is 5.5KW.)

What did the customer service department say when you asked them?
Only Screwfix can give the answer as to why they do not stock a product.

In article ,
Si $3o&m wrote:
I need 4mm t&e to wire up an oven and am surprised that Screwfix sell
2.5mm & 6mm but not 4. Is it better to use 6mm? (Oven is 5.5KW.)

Yes. If a dedicated cooker circuit is needed best to future proof it by
going for the maximum likely current requirement - after all the materials
are still a small part of the job despite the rise in copper prices.
Of course this means 10mm for a possible 45 amps - but 6mm is the usual
compromise.

--
*Who is this General Failure chap anyway - and why is he reading my HD? *

Dave Plowman London SW
To e-mail, change noise into sound.

In message , vince
writes
"Si" $3o&m wrote in message
...

I need 4mm t&e to wire up an oven and am surprised that Screwfix sell
2.5mm & 6mm but not 4. Is it better to use 6mm? (Oven is 5.5KW.)

What did the customer service department say when you asked them?
Only Screwfix can give the answer as to why they do not stock a product.

Thanks to John & Dave for their informative answers.

Vince, I asked the question because I reckoned if Screwfix didn't stock
4mm there'd probably be a reason. In fact, buying 25m of 6mm from
Screwfix was cheaper than buying 15m of 4mm from a local shop.

--

Si