ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 10
Recent Posts
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Dimmable LED 2x4 lay in fixtures
by gfretwell. 04/22/17 01:14 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
Electrode boilers question
by SteveFehr. 04/21/17 08:32 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,491 Are you busy
169,152 Re: Forum
162,505 Need opinion
Who's Online Now
0 registered members (), 60 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#216097 - 10/02/15 10:31 PM ELV control wiring colours?  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Hi Guys,
Been ages since I've started a new thread in this area, but I have a question for our Aussie and NZ folks.
I do a lot of work on dairy systems, where they use a 24 Volt control system to power the coils in contactors and what-not.
With some of these systems, you get a box that comes pre-wired and you merely hook the field wiring up to it, that's all well and good.
But, is there a standard that tells us all what wire colours are positive and negative when using the output side of a 24VDC SMPS in a box?
I've seen pink used as the negative, I've also seen orange as the negative, with violet being the positive most times.
Pretty much is seems like it is at the whim of the person that wired the enclosure, this is the reason why I ask if there is actually a standard to be referred to for this sort of thing?


Let's face it, these days if you're not young, you're old - Red Green grin

Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#216110 - 10/06/15 11:22 AM Re: ELV control wiring colours? [Re: Trumpy]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,069
Estero,Fl,usa
On this side of the world I have seen all sorts of different colors used for low voltage and I do not think there is a standard.
Red hot and black common is used a lot. Then the next box over might use white for the hot and black for the common. That is exactly the opposite of what the mains voltage will be.
It seems low voltage engineers don't ever talk to mains voltage engineers.
Once you get past 2 colors, anything goes for the rest.
The only thing that you can usually count on is green with the yellow stripe is <earth> ground ... unless it is a car or a boat. wink


Greg Fretwell

#216123 - 10/08/15 05:57 PM Re: ELV control wiring colours? [Re: Trumpy]  
geoff in UK  Offline
Member
Joined: Dec 2002
Posts: 181
UK
I have noticed (here in UK) that there seem to be numerous "conventions" observed peculiar to specific areas of technology. For example alarm engineers always seem to use the same colours for trigger and tamper circuits; Telephone engineers always use the same colours for line and ringing circuits. If you open up your PCs, the power unit wires seem to correspond between manufacturers, Vehicle wiring seems to have at least some consistency, USB cables seem the same, etc. I don't know where these "standards" originate, but they certainly do exist.


#216136 - 10/12/15 05:53 PM Re: ELV control wiring colours? [Re: Trumpy]  
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,393
Vienna, Austria
True, yet there were several power supply manufacturers that deviated from the usual black/red/yellow for computer 5 and 12 V wiring. I've seen orange instead of either red (Amiga) or yellow (Apple) and blue instead of black (Amiga). Could it be that IBM set the black/red/yellow standard and eventually everyone else followed?

Phone standards were probably once set by monopoly phone companies and then became unwritten law. They're occasionally subject to change though.



Member Spotlight
Potseal
Potseal
Saskatchewan
Posts: 218
Joined: February 2013
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.002s) Memory: 0.7601 MB (Peak: 0.8931 MB) Zlib enabled. Server Time: 2017-04-23 21:48:06 UTC