Hello to everybody:

I have a doubt regarding the color code for ground cables according
EN60204-1 (for CE mark):

In the norm is stated that all protective earth wires MUST be yellow green.

Now my question is the following: 

What color must be cables that are connected to ground because they need to
be referenced to ground, but are NOT protective earth wires? (ex: secondary
of a transformer,...that´s what I think is called functional equipotential
conections )

According to the norm seems that they still need to be yellow-green, but
one guy from TUV told me that these wires MUST NOT be yellow-green (they
could be any different color except yellow-green).

I appreciate your comments, and advises of were to find this information.
Thanks.

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