INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Wire color for foreign voltage (IEC)

Wire color for foreign voltage (IEC)

(OP)
For a system that is being built to IEC-60947, what color should wire be that is carrying foreign voltage that will not be turned off by the enclosure's main disconnect?

I found a chart with the other IEC color codes but it doesn't list "foreign voltage."
In the USA, it's orange when complying with UL and NFPA.

Thanks in advance for any help.

RE: Wire color for foreign voltage (IEC)

NFPA 79 (section from http://ecmweb.com/content/wiring-methods-industria...):

Sec. 16.1.3 allows you to use other colors for the purpose of identification as follows:

• Black represents ungrounded line, load and control conductors at line voltage.

• Red represents ungrounded AC control conductors, at less than line voltage.

• Blue represents ungrounded DC control conductors.

Yellow represents ungrounded control circuit conductors that may remain energized when the main disconnecting means is in the OFF position. These conductors must be yellow throughout the entire circuit, including wiring in the control panel and the external field wiring. International and European Standards require you to use orange for this purpose (see IEC 204-1 for specific requirements).

• White or natural gray represents a grounded circuit conductor.

• White with blue stripe represents a grounded DC current-carrying circuit conductor. International and European standards require you to use light blue for the neutral conductor (see IEC 204-1 for specific requirements).

White with yellow stripe represents grounded AC current-carrying control circuit conductors that remain energized when the disconnecting means is in the OFF position. For additional circuits powered from different sources that remain energized when the main disconnecting means is in the OFF position, you must use striping colors other than green, yellow or blue to uniquely identify the grounded conductors.


The above states "Allows you to use other colors..."....it doesn't state you must use these colors. I think the color of wire insulation would depend on the source, not the destination. How can it be identified as orange or yellow from the source (since it wouldn't be foreign voltage at the source)?

In my projects in Chemical Plants and refineries, we aren't building the NFPA specified panels, so never paid attention to this. The only thing I've done, is to label the cabinet with "Caution: Foreign Voltage Present", or something to that effect.

______________________________________________________________________________
This is normally the space where people post something insightful.

RE: Wire color for foreign voltage (IEC)

We generally use orange for alarms and similar signals with externally-supplied voltage.

IEC 60947 is really a component standard rather than a panel-building standard.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close