EN60204-1 wire colors

[rbouws]

Hello, I've read the EN60204 section on wire colors for Europe and checked around online and one thing is still unclear to me. What wire color is used for the grounded current carrying dc conductor (what I typically refer to as DC Common) in 24VDC circuits on industrial control panels. I see that Lt Blue is the neutral (I assume AC only) and DC control circuits are blue (dark blue). I supposed I could use dark blue for both the +24 and DC Common but I'm wondering do European panel builders typically do.

 

[just the cowboy]

We have allot of Euro equipment, and I see them use dark blue wire with a Red + or Black - wire end.