6mm imperial current rating

[AndyPRK]

hi.

Does anyone know the current capacity for the imperial equivalent of 6mm? It’s a lot thicker than 6mm.

Could a 40 or 45A Mcb be used ?

Thanks

 

[bernardgreen]

The information is here

https://www.diynot.com/wiki/Electrics:Old-Imperial-cable-sizes

7/.036 4.59mm²
7/.044 6.86mm²

 

[AndyPRK]

37A then.

Thanks

 

[sparkwright]

You have a cable slightly larger than 6mm2, yet it's only good for 37A?

 

[AndyPRK]

Yeah it doesn’t seam right to me either

I wouldn’t use the word slightly

 

[sparkwright]

Is it more like 10mm2 equivalent?

 

[AndyPRK]

It’s not at big as 10mm.

More like 8mm

Cooker circuit.

 

[sparkwright]

Presumably 7/.044 then?

 

[sparkwright]

How did you get 37A?

 

[AndyPRK]

I looked at the link at the start for .044 clipped direct

 

[JohnW2]

You have a cable slightly larger than 6mm2, yet it's only good for 37A?

Those CCCs relate to "coarse excess current protection" (which I suspect may mean BS3036 fuses or suchlike) and, per the below, may be multiplied by 1.33 (turning 37A into about 49A) if one has 'close excess-current protection" (which I suspect {but may be wrong!} may be closer to an MCB)

Kind Regards, John

 

[flameport]

 

[JohnW2]

<an image of the 'missing page' of what was previously available!>

Thanks. That seems to confirm my speculation above - i.e. that the CCC figures quoted can be multiplied by roughly (1.5 is almost the same as 1.45) 1.33 if protection is provided by an MCB.

Kind Regards, John

 

[AndyPRK]

49A

 

[JohnW2]

49A

Yep, as I said, 37A x 1.33 is about 49A.

Kind Regards, John