ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
This anti-theist is priceless!!!
by djk. 11/14/18 07:19 AM
Single phase and what you call it.
by dsk. 11/12/18 11:10 AM
220/230/240V 60Hz Systems
by Albert. 11/07/18 12:48 AM
Black & Decker Recalls Hammer Drills
by Admin. 11/01/18 07:22 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 31 guests, and 22 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Question about 600Y347 #101606
02/13/02 07:45 PM
02/13/02 07:45 PM
CTwireman  Offline OP
Joined: Feb 2002
Posts: 840
Connecticut, USA
Do you use 600Y347 instead of 480Y277 in Canada, or are both voltages available?

What is the commonly used color-coding for a 600/347 volt system?

As you probably know allready we use brown-orange-yellow-gray for 480.

Any idea why 600 is not used in the U.S.?

Tools for Electricians:
Re: Question about 600Y347 #101607
02/14/02 04:33 PM
02/14/02 04:33 PM
Tony Moscioni  Offline
Joined: May 2001
Posts: 144
In Canada, the primary voltage for industrial / commercial secondary distribution is 347/600v.

However, you can also spec 277 / 480v if so desired.

The automotive industry and most of it's subsidaries use the 480 volt secondary distribution system.

Rule 4-036 Colour of Conductors

Where colour coded circuits are required, the following colour coding shall be used, except in the case of service-entrance cable and insofar as Rules 4-030, 4-032, and 6-308 may modify these requirements:

1 phase ac or dc (2-wire) — 1 black and 1 red
1 black and 1 white*† (where identified conductor is required);
1 phase ac or dc (3-wire) — 1 black, 1 red, and 1 white*†;
3 phase ac — 1 red (phase A),
1 black (phase B),
1 blue (phase C), and
1 white* (where neutral is required)
*Or natural grey;
†Or white with coloured stripe (see Subrule 4-034).
(4) Where the mid-point of one phase of a 4-wire delta-connected secondary is grounded to supply lighting and similar loads, the conductors shall be colour coded in accordance with Subrule (3) and the phase A conductor shall be the conductor having the higher voltage-to-ground.

Rationale for Rule 4-036.
It is desirable that there be a universal or at least a national colour code for conductors, rather than several varieties, to avoid confusion and provide greater safety.

Intent for Rule 4-036.
In Subrule (3), we intend that when colour-coded circuits are required, phase A conductors be coloured red, phase B conductors be coloured black, phase C conductors be coloured blue, and the neutral conductors be coloured white or white with a coloured stripe where more than one system is present in the raceway, box, or enclosure.
In Subrule (4), occasions arise where a delta-connection secondary is grounded to supply lighting and similar loads in addition to polyphase motors, so that the one phase has a higher voltage-to-ground than the other two phases. We intend that this phase be designated as Phase A and the conductors coloured red as per Subrule (3).

Tony Moscioni
Electrical Inspector
Electrical Safety Authority

Re: Question about 600Y347 #101608
02/14/02 07:20 PM
02/14/02 07:20 PM
CTwireman  Offline OP
Joined: Feb 2002
Posts: 840
Connecticut, USA
Thanks for your answers.

The brown/orange/yellow/gray is not a code requirement here in the US, but it is commonly used and specified.

How do you differentiate between different voltage systems in a building, ie, a building with 600/347 and 120/208? If I interpret the CEC rule correctly, do different voltage systems utilize the same color code?

120/240 is also a common voltage system in Canada, right?

I am under the impression that US and Canadian systems are similar but there are also some big differences.

[This message has been edited by CTwireman (edited 02-14-2002).]

Re: Question about 600Y347 #101609
02/15/02 01:43 PM
02/15/02 01:43 PM
ggardiner  Offline
Joined: Oct 2001
Posts: 81
Calgary, Alberta Canada
Most of us use the brown yellow orange for 600 volt wiring.I'm not sure if this was changed in the 2002 code but I know it not a code but a trade practice.


2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Levittown, PA
Posts: 810
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 8
Popular Topics(Views)
251,476 Are you busy
188,670 Re: Forum
178,370 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.026s Queries: 14 (0.005s) Memory: 0.9613 MB (Peak: 1.0929 MB) Zlib enabled. Server Time: 2018-11-15 12:35:38 UTC