Flex used in walls?

[justintime2]

Sorry, image sizes corrected.

Kind regards
Justin

 

[stillp]

Looks like 1.5 mm2 to me.

 

[justintime2]

Looks like 1.5 mm2 to me.

Oh, when you refer to a size like that are you referring to the diameter of just the copper core?

Kind regards
Justin

 

[JohnW2]

Looks like 1.5 mm2 to me.

Oh, when you refer to a size like that are you referring to the diameter of just the copper core?

The cross-sectional area of (each of the) copper cores.

Kind Regards, John

 

[ban-all-sheds]

//www.diynot.com/wiki/Electrics:flatpvccables

 

[JohnW2]

//www.diynot.com/wiki/Electrics%3Aflatpvccables

What is the relevance of that to a round flexible cable?

Kind Regards, John

 

[ban-all-sheds]

Oh, when you refer to a size like that are you referring to the diameter of just the copper core?

The cross-sectional area of (each of the) copper cores.

Looks like 1.5 mm2 to me.

 

[justintime2]

Well I've measured across the diameter of the copper stranded core having made a fresh cut off the end and it measures 2mm so I'm confused now what type of flex this is.

Kind regards
Justin

 

[JohnW2]

Well I've measured across the diameter of the copper stranded core having made a fresh cut off the end and it measures 2mm so I'm confused now what type of flex this is.

Do you have a micrometer or vernier caliper which would enable you to measure the diameter of one of the strands (and also count the number of strands)?

Kind Regards, John

 

[justintime2]

Hi

Unfortunately I don't have those tools but have counted the stands to be 47 or thereabouts, might have missed 1 or 2.

Kind regards
Justin

 

[JohnW2]

Unfortunately I don't have those tools but have counted the stands to be 47 or thereabouts, might have missed 1 or 2.

I'm not totally sure where that leaves us. 1.25mm² flex usually has 40 strands, each of 0.2mm diameter, 1.5mm² flex usually has 30 strands each of 0.25mm diameter and 2.5mm² flex usually has 50 strands each of 0.25mm diameter.

On the basis of the number of strands you've counted (plus maybe 3 missed), it sounds as if you may have 2.5mm² flexible cable. What is the outside diameter of the entire cable (the outside white sheathing)?

Kind Regards, John

 

[justintime2]

Hi

It measures 10mm across the diameter including the white outer sheath.

Kind regards
Justin

 

[JohnW2]

It measures 10mm across the diameter including the white outer sheath.

OK. In that case, coupled with the ~50 strands per core, and despite what stillp suggested, what you have is almost certainly 2.5mm² flexible cable.

Kind Regards, John

 

[ban-all-sheds]

And for a stranded cable, 2mm OD is pretty close to 1.78mm.

That's the usefulness of that table - you don't need to have fantastically precise measuring tools. Because there's a limited range of standard sizes a less-than-precise measurement is usually close enough to one of them to conclude that it must be that one.

 

[JohnW2]

And for a stranded cable, 2mm OD is pretty close to 1.78mm. ... That's the usefulness of that table - you don't need to have fantastically precise measuring tools. Because there's a limited range of standard sizes a less-than-precise measurement is usually close enough to one of them to conclude that it must be that one.

All true - in fact far better if one factors in the 'rule of thumb' that, for the sort of sizes we're commonly interested in, the overall diameter of a stranded core tends to be around 10% greater than that of a solid core of the same CSA.

1.78mm + 10% = 1.96mm

Kind Regards, John