Cable Specs

[Rockhopper]

Recently I have bought some 2.5mm twin and earth to add some sockets to my ring main. The cable grey outer covering has a 2.5 marking on it however when I strip to copper and check the diameter with a vernier I get a reading of just under 2mm. Is this similar to joinery where wood is bought as say 2" Par (planed all round) and the finished size of the wood you buy is more like 1 and 3/4"

 

[RF Lighting]

The reason you are getting confused is the cable size (2.5mm2) is refereing to Cross Sectional Area (CSA) of the conductor, NOT its overall diameter. Hope this helps.

Rob

 

[ban-all-sheds]

The diameter of 2.5mm² is 1.784mm

 

[Rockhopper]

The reason you are getting confused is the cable size (2.5mm2) is refereing to Cross Sectional Area (CSA) of the conductor, NOT its overall diameter. Hope this helps.

Rob

Thanks that's interesting.
RH

 

[ebee]

1.784124116

It`s not like Ban to be so inaccurate .


LOL

 

[Adam_151]

such precision is not usful because it gives a false idea of the tolerances involved ...

http://www.theiet.org/forums/forum/messageview.cfm?catid=205&threadid=9686&enterthread=y

as you should know

 

[ebee]

I know, it`s just my sense (or lack of) humour.
sure Ban will appreciate it

 

[ban-all-sheds]

1.784124116

It`s not like Ban to be so inaccurate .

Sorry.

The diameter of 2.5mm² is about 2/29ths of an inch..

 

[ebee]

Brill

 

[ebee]

Cable Sizes

CSA Dia (mm) Dia ( Inch) ” x/y

1.0 1.1284 0.0443 2/45

1.5 1.382 0.0544 2/37

2.5 1.7841 0.0702 2/29 c BAS

4.0 0.853 (7 Strands) 0.0336 3/89

6.0 1.0447 (7 Strands) 0.0411 3/73

10.0 1.3487 (7 Strands) 0.0531 5/94

16.0 1.7059 (7 Strands) 0.0672 9/134

25.0 2.1324 (7 Strands) 0.084 9/107

Note - ONLY APPROXIMATIONS