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AMD 2 - changes to conductor colour coding

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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  • Presumably the earthed side of a DC supply is still blue ?


    So two wire DC negative earth would be blue for earthed negative and red for positive.

    And two wire DC positive earth would be blue for the earthed positive and white for negative.

    And three wire DC would be red for positive outer, blue for earthed middle wire, and white for negative outer.


    Blue for positive "just seems wrong" even if it is the earthed side of the supply.

    Not very keen on pink for functional earth either, cream was fairy well established for the minority of installations that needed it.
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  • Presumably the earthed side of a DC supply is still blue ?


    So two wire DC negative earth would be blue for earthed negative and red for positive.

    And two wire DC positive earth would be blue for the earthed positive and white for negative.

    And three wire DC would be red for positive outer, blue for earthed middle wire, and white for negative outer.


    Blue for positive "just seems wrong" even if it is the earthed side of the supply.

    Not very keen on pink for functional earth either, cream was fairy well established for the minority of installations that needed it.
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