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 or 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 02/14/0208:20 PM02/14/0208:20 PM
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 02/15/0202:43 PM02/15/0202:43 PM