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AMD 2 - changes to conductor colour coding

AJJewsbury
It seems that AMD 2 is introducing yet another big change to colour coding - albeit only for DC systems. +ve is changing from brown to red and -ve from grey to white.


Also functional earths are changing from Cream to Pink.


Anyone know


a) why the change?

b) why the "old" (i.e. brown/blue) colours aren't permitted as an alternative?


(the 2nd question is about being able to comply with two different versions of BS 7671 at the same time - e.g. where legislation demands compliance with an older version but customer requirements are for compliance with the latest version - DC systems being increasingly common in domestic installations - e.g. PV systems.)


   - Andy.
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    gkenyon:
    Legh Richardson:

    Pink in a dim light could be taken as cream and visa versa.

    Legh


    No issue there then? The previous colour for TFE in BS 7671 was Cream.


    It's important to note that Cream is not a recognized colour for conductors, the recognized colours from which single-colour and bi-colour insulation can be made are (and have been for many a long year):


    Black

    Brown

    Red

    Orange

    Yellow

    Green

    Blue

    Violet

    Grey

    White

    Turquoise

    Pink


    This list appears in item 8 of Appendix 7 (Table 7F) in the Amendment 2 DPC (although in alphabetical order of the 2-letter colour code.




    Thanks Graham. Thinking about it, I can still come up with a DC installation that satisfies BS 7671:2018 and AMD2 simultaneously if I ignore the colour codes and mark everything L+/L- etc.


    Any idea why green is still conspicuous by its absence from table 51 for line conductors of ELV and control circuits? (514.4.5 removed its objection to green quite a while ago now).


       - Andy.


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  • 0
    gkenyon:
    Legh Richardson:

    Pink in a dim light could be taken as cream and visa versa.

    Legh


    No issue there then? The previous colour for TFE in BS 7671 was Cream.


    It's important to note that Cream is not a recognized colour for conductors, the recognized colours from which single-colour and bi-colour insulation can be made are (and have been for many a long year):


    Black

    Brown

    Red

    Orange

    Yellow

    Green

    Blue

    Violet

    Grey

    White

    Turquoise

    Pink


    This list appears in item 8 of Appendix 7 (Table 7F) in the Amendment 2 DPC (although in alphabetical order of the 2-letter colour code.




    Thanks Graham. Thinking about it, I can still come up with a DC installation that satisfies BS 7671:2018 and AMD2 simultaneously if I ignore the colour codes and mark everything L+/L- etc.


    Any idea why green is still conspicuous by its absence from table 51 for line conductors of ELV and control circuits? (514.4.5 removed its objection to green quite a while ago now).


       - Andy.


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