ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video door bell causing chime activation of coil
by gfretwell. 12/10/18 12:35 AM
Conduit fill Calculations
by gfretwell. 12/08/18 08:39 PM
Pull out fuse panel?
by Trumpy. 12/06/18 02:12 AM
Swimming Pool question
by HotLine1. 12/05/18 12:37 PM
Tingle off the water spigot
by rmiell. 11/30/18 01:03 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 33 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Date of adoption? #100401
11/16/06 06:03 PM
11/16/06 06:03 PM
V
VAElec  Offline OP
Member
Joined: Jul 2005
Posts: 49
Sterling, Virginia, US
Without tracking down previous editions of the code and referencing them, is anyone aware of a method to find out when a section of the code was adopted/amended? Example I saw today that brings this to mind: 3-phase 4-wire delta-connected panel. High leg was marked orange (good per NEC 384-3 (e) '99), but landed on C phase (bad per NEC 384-3 (f) '99). Don't know when the panel was installed but would say within the last 20-30 years. Was landing the high leg on anything but B phase ever acceptable (I'm sure it was at some point but that's that whole me assuming things problem). But the main question is when we are asked to “take a look at something” and it is to code but for one small thing, how do we figure out if it was acceptable at some point. I mean other than asking the question here.


Pete
2017 / 2014 NEC & Related Books and Study Guides
Re: Date of adoption? #100402
11/16/06 07:50 PM
11/16/06 07:50 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I really don't know of any way of checking. I know that some utility companies require the high leg to be C phase in the meter. In the panelboards,

B phase gets the extra bracing so putting the high leg anywhere else could be a problem.

Looking at my oldest code book (1978) 384-3(f) "...The B phase shall be that phase having a higher voltage to ground."


Few things are harder to put up with than the annoyance of a good example.
Re: Date of adoption? #100403
11/16/06 10:26 PM
11/16/06 10:26 PM
S
ShockMe77  Offline
Member
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
I've come across existing installations where the high-leg is on the 'C' phase alot. I'll have to check my POCO specs book (PSE&G) and see if they're required like that around here. I know it's not what the NEC calls for, but most of the high-leg 3-phase services are identified with red tape, not orange.

Re: Date of adoption? #100404
11/17/06 10:25 AM
11/17/06 10:25 AM
P
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Quote
Looking at my oldest code book (1978) 384-3(f) "...The B phase shall be that phase having a higher voltage to ground."


There's no 384-3(f) in the 1971 NEC, nor can I see any other applicable reference within article 384.

200-6(c) in 1971 covered general identification of the high-leg:

Quote
Where, on a 4-wire delta-connected secondary, the midpoint of one phase is grounded to supply lighting and similar loads, that phase conductor having the higher voltage to ground shall be orange in color or be indicated by tagging or other effective means at any point where a connection is to be made if the neutral conductor is present.


The part I've quoted bold has the "changed from previous edition" line alongside. I seem to recall a discussion a while back in which it was decided that 1971 was the first time orange was suggested specifically.

Still nothing about the high leg having to be B phase that I can find though.


Featured:

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

 

Member Spotlight
HotLine1
HotLine1
Brick, NJ USA
Posts: 7,050
Joined: April 2002
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
252,146 Are you busy
189,151 Re: Forum
178,823 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.025s Queries: 14 (0.004s) Memory: 0.9614 MB (Peak: 1.0911 MB) Zlib enabled. Server Time: 2018-12-11 11:56:48 UTC