Talk:Twin and earth

I know BS numbers are quoted in this article but I'm not entirely convinced about the sheath colours. Pretty much all T+E is LS0H nowadays, and I'm sure the 16th edition OSG specified black PVC for outdoor use, not just T+E painted black.

Err - the article does not mention black cable or black paint ! Maybe its an old comment. Actually neither LSZH nor PVC that is only to the BS is UV resistant, as that is not tested in the BS tests. It may or may not be OK for outdoors, but depending what the maker has added, so in practice the makers data must be obtained beforee deciding. Actually if sun exposure is a problem, it is far more common in the UK to either put conduit outside for short hops or to run SWA for supplies to outbuildings and so forth.

Technically the article is OK as as far as it goes - just that is not going very far, and it is not a good fir with other articles in wikipedia It may benefit from a note on operating temperatures, table of current ratings, installation methods etc.. IF I have time I may try my hand at the next free weekend. MikePJ — Preceding unsigned comment added by 78.147.24.159 (talk) 07:26, 8 May 2017 (UTC)

Twin and earth with uninsulated earth conductor

re: "UK wiring regulations however do not at present (BS 7671:2018) recognise Twin and Earth or Flat TPS with a full sized and insulated (G/Y) earth conductor as a permitted cable type"

BS 7671:2018 section 543.3.201 states that a protective condutor shall be insulated to the same standard as a single-core cable of the same size except when part of a multicore cable or where metal conduit or other metal support system is used as an earth. However I believe that these are optional not mandatory exceptions. Otherwise many types of commonly used types of cable e.g. 3 core flex, 3-core SWA etc. would not be allowed. So I can't see why the Irish-style twin and earth cables could not be used in U.K. Peter.edelsten (talk) 14:05, 20 May 2023 (UTC)