SY, CY None Compliant????

So, I'm out on site the other day and the apprentice is installing some SY cable for a ring final circuit. Anyway, we got chatting and he mentions that this type of cable does not comply with BS7671! I said, "of course it does, it's part of the AM2 and it is one of the 7 cable types of the new 2357 apprenticeship NVQ! So out of curiosity I had a look. To my suprise, it does state in the BS7671, that this type, along with YY, CY are none compliant!! I know that most of this multi-core cable comes with none standard colour cores etc but does any one know an actual reason why it is none compliant? I am genuinely interested.

Cheers

Jay

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