wrote:
Hello,

Can I ask a daft question: when a cable is described as being 25mm,
what does this mean because it certainly is not an inch thick!?

Thanks.


2.5mm is a more likely dimension. It means (as far as I'm aware) the
cross-sectional area of the conductors (at least the live and neutral
ones - the earth in twin-and-earth cable is usually a bit less beefy
than the other two).

Here's a useful conversion table that I cut and pasted from somewhere
some time ago:

CSA (CPC) Strands Overall
mm^2 No./dia. mm approx.
--------- ------- ----------
1.0 (1.0) 1/1.13 4.5 x 8.2
1.5 (1.0) 1/1.38 4.7 x 8.2
2.5 (1.5) 1/1.78* 5.3 x 9.9
4.0 (1.5) 7/0.85 6.1 x 11.4
6.0 (2.5) 7/1.04 6.8 x 13.1
10 (4.0) 7/1.35 8.4 x 16.8
16 (6.0) 7/1.71 9.6 x 19.5
* or 7/0.67

Martin Pentreath wrote:

Here's a useful conversion table that I cut and pasted from somewhere
some time ago:

CSA (CPC) Strands Overall
[snip]

From here actually:

http://groups.google.com/group/uk.d-...e=source&hl=en

where it can be found without the original formatting messed up :-)

--
Andy

On 21 Jan 2007 15:05:18 -0800, "Martin Pentreath"
wrote:

wrote:
| Hello,
|
| Can I ask a daft question: when a cable is described as being 25mm,
| what does this mean because it certainly is not an inch thick!?
|
| Thanks.
|
|
|2.5mm is a more likely dimension. It means (as far as I'm aware) the
|cross-sectional area of the conductors (at least the live and neutral
|ones - the earth in twin-and-earth cable is usually a bit less beefy
|than the other two).
|
|Here's a useful conversion table that I cut and pasted from somewhere
|some time ago:
|
|CSA (CPC) Strands Overall
|mm^2 No./dia. mm approx.
|--------- ------- ----------
|1.0 (1.0) 1/1.13 4.5 x 8.2
|1.5 (1.0) 1/1.38 4.7 x 8.2
|2.5 (1.5) 1/1.78* 5.3 x 9.9
|4.0 (1.5) 7/0.85 6.1 x 11.4
|6.0 (2.5) 7/1.04 6.8 x 13.1
|10 (4.0) 7/1.35 8.4 x 16.8
|16 (6.0) 7/1.71 9.6 x 19.5
|* or 7/0.67

I suppose 7/029 and 3/036 (number of strands/diameter of 1/1000 ins) are
long forgotten except by really *old* engineers like me :-(
--
Dave Fawthrop dave hyphenologist co uk Google Groups is IME the *worst*
method of accessing usenet. GG subscribers would be well advised get a
newsreader, say Agent, and a newsserver, say news.individual.net. These
will allow them: to see only *new* posts, a killfile, and other goodies.

In article ,
Dave Fawthrop wrote:
I suppose 7/029 and 3/036 (number of strands/diameter of 1/1000 ins) are
long forgotten except by really *old* engineers like me :-(

Just remember their replacements are 2.5 and 1.5mm² ;-)

--
*The fact that no one understands you doesn't mean you're an artist

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

Andy Wade wrote:
Martin Pentreath wrote:

Here's a useful conversion table that I cut and pasted from somewhere
some time ago:

CSA (CPC) Strands Overall
[snip]

From here actually:

http://groups.google.com/group/uk.d-...e=source&hl=en

where it can be found without the original formatting messed up :-)

--
Andy

Ah yes, that looks much better.

As a tribute to its usefulness I'd cut and pasted it into my palm
computer where I keep important bits of DIY trivia for reference when
needed. Unfortunately the palm is not as good as Google when it comes
to retaining formatting, but it's easier to refer to when you're
rooting around in the cellar trying to work out what's what!

Cheers!

Martin