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Topic Title: Panel wire colours
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Created On: 09 December 2009 09:54 AM
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 09 December 2009 09:54 AM
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Wessex

Posts: 72
Joined: 26 June 2009

I understand that red is used to identify ac control circuits within a control panel. I'm looking to discriminate between 110 and 24Vac. Excluding yellow and green, is there a colour commonly used for 24Vac
 09 December 2009 10:29 AM
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gkenyon

Posts: 4478
Joined: 06 May 2002

Generally, I don't think you can go far wrong if you follow EN60204-1 for control wiring. This is the "Machinery" industry standard for electrical safety, and does cover "controls".

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Eur Ing Graham Kenyon CEng MIET TechIOSH
 09 December 2009 10:50 AM
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Wessex

Posts: 72
Joined: 26 June 2009

Many thanks
 09 December 2009 10:51 AM
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oneye

Posts: 161
Joined: 25 February 2008

The quoted Spec is a little vague, generally the end user specification dictates wire colours to be consistent with other panels on their site.

24Vdc tends to be red/black, 24Vac could be light blue / dark blue but that can easily confuse 110Vac brown/blue.
Some have 24Vac orange/orange whereas other clients have orange/orange to be voltfree non isolated external supply @ any voltage.

You need to nail down what colours are acceptable before you start.
 09 December 2009 02:43 PM
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paulskyrme

Posts: 758
Joined: 12 February 2003

Originally posted by: oneye

The quoted Spec is a little vague, generally the end user specification dictates wire colours to be consistent with other panels on their site.

24Vdc tends to be red/black, 24Vac could be light blue / dark blue but that can easily confuse 110Vac brown/blue.

Some have 24Vac orange/orange whereas other clients have orange/orange to be voltfree non isolated external supply @ any voltage.

You need to nail down what colours are acceptable before you start.


All panels I have worked on previously had the ac/dc colours opposite to the quote above.
Whilst I agree the spec is vague & BS EN 60204-1:2006 is the standard to work too. See paragraph 13.2.4. Red = ac control circuits at any voltage. Black = ac & dc POWER circuits at any voltage. Blue = dc control circuits at any voltage. Orange = excepted circuits according to para 5.3.5. White tends to be functional earths, taken from BS7671.
There is a few colours that you can use, but as per previous post, get customer specs, or at least written agreement.
You can't use, yellow, green or green/yellow if it may be confused!
I have only seen orange "live with main isolator off" that is fed from another source.
Not seen brown in a control panel except incoming (new colours) and in special multicore cables, signal wiring etc.
There are other relevant standards as well depending on the equipment.
HTH
Paul
 21 December 2009 10:22 AM
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Wheelermch

Posts: 39
Joined: 04 June 2007

A couple of years ago I put together a spread sheet on wire colours. Copying / pasting doesn't work to well in the forum but this should identify what was current 2 years ago (still think it is but not checked)

Hope it helps

Regards

Howard Wheeler

Phase L1
BS 7671:2008 - Brown
BS EN 60446:2000 Brown & Black preferred
BS EN 60204-1:2006 no comment

Phase L2
BS 7671:2008 - Black
BS EN 60446:2000 Brown & Black preferred
BS EN 60204-1:2006 no comment

Phase L3
BS 7671:2008 - Grey
BS EN 60446:2000 Brown & Black preferred
BS EN 60204-1:2006 no comment

Neutral
BS 7671:2008 - Blue
BS EN 60446:2000 Blue
BS EN 60204-1:2006 Light blue

Single Phase live, L1
BS 7671:2008 - Brown
BS EN 60446:2000 & BS EN 60204-1:2006 no specific comment

Single Phase neutral, N1
BS 7671:2008 - Blue
BS EN 60446:2000 & BS EN 60204-1:2006 no specific comment

Protective conductor
BS 7671:2008 - Green/Yellow
BS EN 60446:2000 Geen / Yellow
BS EN 60204-1:2006 Green / Yellow

PEN
BS 7671 Green/Yellow with blue markings at terminations or Blue with green/yellow markings at terminations
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

Colours not to be used
BS 7671 Green
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

Functional Earthing conductor (e.g signal earths?)
BS 7671 Cream
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. (floating) positive (POWER CCTS)
BS 7671 Brown
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. (floating) negative (POWER CCTS)
BS 7671 Grey
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. Positive (neg earth system) (POWER CCTS)
BS 7671 Brown
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. Negative (neg earth system) (POWER CCTS)
BS 7671 Blue
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. Positive (positive earth system) (POWER CCTS)
BS 7671 Blue
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

D.C. Negative (positive earth system) (POWER CCTS)
BS 7671 Grey
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

Control Circuit positive
BS 7671 Brown, Black, Red, Orange, Yellow, Violet, Grey, White, Pink or Turquoise
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

Control Circuit neutral or mid wire
BS 7671 Blue
BS EN 60446:2000 & BS EN 60204-1:2006 no comment

Conductors other than protective or neutral
BS EN 60204-1:2006 Brown, Black, Red, Orange, Yellow, Violet, Grey, White, Green, Blue, Pink, Turquoise
BS 7671 & BS EN 60446 No comment

A.C. & D.C. power circuits
BS EN 60204-1:2006 Black
BS 7671 & BS EN 60446 No comment

A.C. control circuits
BS EN 60204-1:2006 Red
BS 7671 & BS EN 60446 No comment

D.C. Control circuits
BS EN 60204-1:2006 Blue
BS 7671 & BS EN 60446 No comment

Excepted ccts (not disconnected by supply isolating
device). Eg external interlock circuits, lighting etc
see p27 of EN60204-1 -orange
BS 7671 & BS EN 60446 No comment
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