ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (gfretwell), 32 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
#16420 11/11/02 07:34 PM
Joined: Nov 2002
Posts: 267
W
Member
I'm wondering if this is code compliant. I saw a 277 volt lighting application, they used M/C cable and junction boxes in between conduit runs. The proper color as everyone knows for 277V is B.O.Y.. The M/C of course is black, red, white and green. Where the last connection to the fixture were in pipe they installed BOY as phased. Is this allowed, or do you have to have it tagged, or a continuous color? Any replys would be appreciated. TY

#16421 11/11/02 09:07 PM
Joined: Feb 2002
Posts: 840
C
Member
There are no color-code requirements in the NEC as they relate to voltages.

BOY and Bk/R/Bl are not dictated by the NEC, but are often specified by engineers.


Peter
#16422 11/11/02 09:27 PM
Joined: May 2002
Posts: 132
E
Member
I wonder why? The Canadian Code does.

#16423 11/11/02 09:53 PM
Joined: Oct 2000
Posts: 5,392
S
Member
i think there's some history here too, just gotta dig up the old timers..... [Linked Image]

from my '68 nec...
210-5 Color Code;
(fourth sentence)

All circuit conductors of the same color shall be connected to the same ungrounded feeder conductor throughout the installation.

this also reads in the '71, but the colors dictated in the '68 were arranged into a FPN ( or what appears to be a fpn?)



[This message has been edited by sparky (edited 11-11-2002).]

#16424 11/11/02 10:30 PM
Joined: Apr 2002
Posts: 7,381
Likes: 7
Member
Did I miss something??
"MC is blk, red, white & green, the last connection to the fixture were in pipe, they installed BOY as phased"

Did they use the green for a c.c.c.???
Or did I miss something???
John


John
#16425 11/11/02 11:13 PM
Joined: Nov 2002
Posts: 267
W
Member
Hotline. I'm not sure what you missed.Let me try to clearify. They used 10/3 M/C cable in btween conduit runs. There was conduit leaving the panelboard using Brown, orange yellow to the 1st J.B. from that j.b was 10/3 M/C through the corridors to several j.bs where conduit was branched off to the outlet boxes where the lighting fixtures were attached, and this was brn, org, yellow, phased according to panelboard circuitry, IE: brown being ckt #1 Org being ckt # 3 on so forth. Just the mixing of colors was my concern.

#16426 11/12/02 12:06 AM
Joined: Nov 2000
Posts: 2,148
R
Member
It is most likely that there is a violation of 210.4(D) here. This section requires that where there are two or more voltage systems in a building, that all hots of multiwre branch circuits be identified as to phase and voltage.
Don


Don(resqcapt19)
#16427 11/12/02 08:43 AM
Joined: Mar 2001
Posts: 2,056
R
Member
Being that 210.4(D) refers to multiwire circuits, I guess a 3 phase motor ckt. at 480V. could be fed with standard MC cable that is colored Bk, R, Bl. and still be in compliance?

#16428 11/12/02 09:19 AM
Joined: Dec 2000
Posts: 4,294
Member
Don, Rojosy,
Interesting. The term "multiwire branch circuit" wasn't included in 210-4(d) until the '99 NEC. (Which has been adopted at long last here in CA less than 2 weeks ago)
I guess that also means that no feeders must be color coded either, and that a 2 wire circuit can be any color you wish?...S



[This message has been edited by electure (edited 11-12-2002).]

#16429 11/12/02 10:15 AM
Joined: Oct 2001
Posts: 597
E
Member
Sparky,

Looking back to the '62 NEC, 210-5 says:
Quote
Color Code. Where installed in raceways, as aluminum sheathed cable, as open work, or as concealed knob-and-tube work, the conductors of multi-wire branch circuits and two-wire branch circuits connected to the same system shall conform to the following color code. Three-wire circuits - one black, one white, one red; four-wire circuits - one black, one white, one red, one blue; five-wire circuits - one black, one white, one red, one blue, one yellow. Where more than one multi-wire branch circuit is carried through a single raceway the ungrounded conductors of the additional circuit may be of colors other than those specified. All circuit conductors of the same color shall be connected to the same ungrounded feeder conductor throughout the installation.

Abbott's NEC Handbook (Frank Stetka) adds the explanation:
Quote
The color coding of multi-wire banch-circuit conductors is necessary in order that the loads may be properly balanced between the ungrounded conductors.

Al


Al Hildenbrand
Page 1 of 2 1 2

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5