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 :-(
--
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