Colin Wilson wrote:

You, sir, are a god :-p

A totally OTT remark, Sir, but at least you didn't use a capital G :~)


Anyway, I've previously posted a table of current ratings too. Here are
the two tables combined into one, together with some new ratings from
the draft 17th edition:

CSA (CPC) Ratings in amperes Strands Overall
square mm A B C D+ E+ No./dia. mm approx.
---------- ---- -- -- -- ---- ------- ----------
1 (1) 11.5 12 16 13 10.5 1/1.13 4.5 x 8.2
1.5 (1) 14.5 15 20 16 13 1/1.38 4.7 x 8.2
2.5 (1.5) 20 21 27 21 17 1/1.78* 5.3 x 9.9
4 (1.5) 26 27 37 27 22 7/0.85 6.1 x 11.4
6 (2.5) 32 35 47 34 27 7/1.04 6.8 x 13.1
10 (4) 44 47 64 45 36 7/1.35 8.4 x 16.8
16 (6) 57 63 85 57 46 7/1.71 9.6 x 19.5

* 7/0.67 also available (but rare)

Key to current rating columns:

A - in conduit in insulated wall (ref. method 6)
B - directly in insulated wall (ref. method 15)
C - clipped direct (ref. method 1)

Ratings (BS 7671 Table 4D5A) apply for ambient temperature of 30 deg.C
and conductor temperature of 70 deg.C

+ New ratings from draft 17th edition:

D - above plasterboard ceiling covered by thermal insulation,
insulation thickness 100 mm
E - as D but with insulation thickness 100 mm

(Technically these are not yet in force and should be regarded as
provisional.)

All the usual derating factors apply (see appendix 4 of BS 7671 or
appendix 6 of the OSG).

--
Andy