Hi,
Searched high and low.
Could someone please verify the following 'Imperial' 'stranded' cable conductor dimensions.
Uk circa 1968, 1966 14th Edition I believe. 2+E PVC insulated & Sheathed.
Particularly the CPC values.
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Phase : 7 x 0.029" diam. CPC : 3 x 0.036" diam. Is this correct? or was the CPC 3 x 0.029" If it isn't too much trouble, could someone please check by reference?

I have measured the old stuff using micrometer, but unfortunately mislaid the notes for this cable.
I am sure CPC was 3 x 0.036" but have been thrown by some possibly vague posts elsewhere on the web.

Many thanks,
Jak

Ok, sorted.
Found more cable, accurately measured diameters of cpc 0.036" x 3 strands equates to 1.98mm² CSA.
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Hello jak, and welcome to the forum.

I'm pretty sure that the 13th and/or 14th editions had a table showing the ECC (Earth Continuity Conductor, the then-current term) sizes for T&E cable. I'll try and find it later and scan.

We already have this table of Imperial cable current ratings from the 14th edition on the site, but it doesn't include ECC/CPC sizes:

https://www.electrical-contractor.net/pc/IEE1966_T3.JPG

Here you go -- From the 14th edition, 1966:

https://www.electrical-contractor.net/pc/IEE1966_TableD2.jpg

7/029 was imperial equivalent of 2.5mm
7/036 was imperial equivalent of 4.0mm

The full range of smaller Imperial sizes for current-carrying conductors, with metric equivalent to two decimal places:

1/.044 = 0.97 sq. mm
3/.029 = 1.29
3/.036 = 1.94
7/.029 = 2.90
7/.036 = 4.52
7/.044 = 6.45
7/.052 = 9.35
7/.064 = 14.52

And to one decimal place:

19/.044 = 19.4
19/.052 = 25.8
19/.064 = 38.7
19/.083 = 64.5
37/.072 = 96.8
37/.083 = 129.0
37/.103 = 193.6