Presence of earthing arrangements for combined protective and functional purposes.

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WSparky

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Looking for an example of "Presence of earthing arrangements for combined protective and functional purposes" I know protective conductor is Green/ Yellow and Functional is Cream and I know the difference between them but could you give me a couple of examples of where these would be combined please. 

 
Thank you for the reply Andy. I have seen a functional conductor on a telecommunications system and I have obviously seen a protective conductor. But I am struggling to find any information on where I could find it combined. How would it work with the colouring of the conductors if they are combined? 

 
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