Further to my post on this subject, it's worth noting that the "white with
blue stripe" or "blue with white stripe" combinations often seen in machine
tools are not defined in EN 60204-1. The white/blue combo was defined in NFPA
79, and remains in clause 13.2.3.2(1) in the current edition (2007).
Blue/white is not defined in any standard as a grounded DC return, and is an
error commonly repeated in the machine tool world.
--
Doug Nix
d...@ieee.org
On 16-Dec-09, at 12:31 , Glyn Garside wrote:
Careful, I think we have 2 questions here. First was I think for the
building
wiring.
Q below is for a "system". What kind of system? If an industrial
machine, EN
60204 series, already mentioned, is applicable. If some other kind of system,
there may be other requirements. (If none, only then I might use wiring regs
or 60204 as guidance.)
Most of the colours mentioned below such as yellow or orange have
special
meanings in some stds. Using black for ground seems a bad idea. Is it really
ground, or just the 0V / return?
Glyn Garside
-----Original Message-----
From: John Cochran <jcoch...@strongarm.com>
Sent: Wednesday, December 16, 2009 8:04 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Cable colours for DC wiring
I would like to know this also, as I can find no definite standard for
DC
wire colors in Europe or US. We did have one system evaluated in Denmark, and
they insisted that the +24VDC wire be blue and its return be white. I tend to
go with the colors used with ATX power supplies: +5V=red, +12V=yellow,
+3.3V=orange, -12V=blue, ground=black.
Thanks,
John Cochran
Strongarm Designs
-----Original Message-----
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On Behalf Of
m...@sfo.com
Sent: Wednesday, December 16, 2009 9:25 AM
To: emc-p...@ieee.org
Subject: Re: Cable colours for DC wiring
It is my understanding that there is no standard for colours except for
safety and earth ground type connections being reserved with greens,
yellow bands, etc.
However, my preference from working in PC power supplies has always been
+12,15V red, return red/black
+5V orange, return orange/black
gnd, black
-5v blue, return blue/black
-12,15v purple, return purple/black
Then all the signal lines were leftover colours.
[The entire original message is not included]
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