ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/21/17 09:27 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,199 Are you busy
174,588 Re: Forum
167,022 Need opinion
Who's Online Now
0 registered members (), 51 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#80855 - 06/07/02 06:20 PM Geen Wire is Not Used as an Equipment Grounding Conductor?  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
"GENERAL

This category covers cable investigated in accordance with International Municipal Signal Association Inc. specifications.

The cable is intended for installation as aerial cable or in underground conduit as part of a traffic signal system.

This cable employs a color-code scheme that permits a conductor with green insulation to be used for other than grounding purposes.

These cables have not been evaluated for flammability.

This cable is not suitable for use as a substitute for cable or wiring systems covered in NFPA 70, "National Electrical Code."

QUESTIONS: Why? Do these systems fall within the scope of Article 725?



[This message has been edited by Joe Tedesco (edited 06-07-2002).]


Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#80856 - 06/07/02 08:41 PM Re: Geen Wire is Not Used as an Equipment Grounding Conductor?  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
What would you bet that "green" was needed for lights of the same? Blue would have brought the system into meltdown.

At one time plain-vanilla tray and pendant cables used green and white in various combinations for conductor identification. The allowance for leaving out green and white in multiconductor assemblies is about 12 years old.

“NEMA WC57-1995/ICEA S-73-532” Table E2 (formerly K2) leaves out green and white from the list. Example at: http://www.nexans.ca/egy/equip/ultx_tc/tray22.htm http://www.drakausa.com/pdfsTAM/t10TPV.pdf http://www.sns.gov/projectinfo/ics/...0Information/Technical%20Information.pdf page 35 has both “K1” and “K2” charts.


#80857 - 06/07/02 09:16 PM Re: Geen Wire is Not Used as an Equipment Grounding Conductor?  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Bjarney:

Thanks! This information is very helpful. I was always concerned about the use of the cable I described above listed by UL.


Joe Tedesco, NEC Consultant

#80858 - 06/07/02 11:44 PM Re: Geen Wire is Not Used as an Equipment Grounding Conductor?  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
If I follow the code correctly, nowadays you can reidentify individual conductors as equipment grounds or grounded circuit conductors in a multiconductor cable, but not the reverse. If one could not use white or green for other than these under the “old” scheme, {although 600V-rated} you’d end up with lots of worthless “spares.”


#80859 - 07/02/02 12:00 AM Re: Geen Wire is Not Used as an Equipment Grounding Conductor?  
Tom Baker  Offline
Member
Joined: Oct 2001
Posts: 30
Bremerton WA
Joe, this cable is commonly used by the Traffic Signal industry, and is called IMSA 19-1 (International Municpial Siganl Association, 19-1 is the cable spec).

It is a five conductor cable
White-common
Red-red display
Yelllow-yellow display
Green-green display
Black-spare, sometimes used in ped signals

Signal heads typically don't have a seperate equipment groudning conductor, but the mast arms are often connected to an EGD.

Many companies make a 19-1 cable, but I don't think a much of it is listed. I'm going to check on this. In fact very, very, little traffic signal equipment is listed. This causes problems with installations where the AHJ gets involved.

I'm a certified Traffic Signal Tech and have been writing a "Code Corner" column in the IMSA Journal for the 18 months.



Member Spotlight
HotLine1
HotLine1
Brick, NJ USA
Posts: 6,853
Joined: April 2002
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: 0.014s Queries: 14 (0.003s) Memory: 0.7704 MB (Peak: 0.9060 MB) Zlib enabled. Server Time: 2017-07-22 06:55:31 UTC