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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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    mapj1:


    I would be very surprised if car makers and telecom systems suddenly change their colour schemes to match this, and I fully expect to still find  power over ethernet using things like orange and white and white and orange as the two poles.

     


    Automotive have their own standards. They refer to LV as HV these days (not sure what term is given to what we used to call the HT circuit driving the plugs).


    I'm comfy that use of the TIA 568B (or for crossover TIA 568A on one end, TIA 568B at the other) colours for CAT x infrastructure, including PoE, is covered in the relevant standards referenced from BS 7671 specifically for such purposes (BS 6701 and its intendant standards, and BS EN 50174-series and the standards referenced there).


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  • 0
    mapj1:


    I would be very surprised if car makers and telecom systems suddenly change their colour schemes to match this, and I fully expect to still find  power over ethernet using things like orange and white and white and orange as the two poles.

     


    Automotive have their own standards. They refer to LV as HV these days (not sure what term is given to what we used to call the HT circuit driving the plugs).


    I'm comfy that use of the TIA 568B (or for crossover TIA 568A on one end, TIA 568B at the other) colours for CAT x infrastructure, including PoE, is covered in the relevant standards referenced from BS 7671 specifically for such purposes (BS 6701 and its intendant standards, and BS EN 50174-series and the standards referenced there).


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