ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#171095 - 11/19/07 03:41 PM Current carrying conductor
GTE Offline
Member
Registered: 03/26/03
Posts: 48
Loc: Bridgehampton, N.Y. USA
Where in the code does it say that the grounded conductor of a 2-wire circuit is counted as a current carrying conductor?
Top
2017 / 2014 NEC & Related Books and Study Guides
#171099 - 11/19/07 05:44 PM Re: Current carrying conductor [Re: GTE]
renosteinke Offline
Cat Servant
Member
Registered: 01/22/05
Posts: 5316
Loc: Blue Collar Country
Does it need to? It seems patently obvious that if you get a reading on an amp clamp, it's a current carrying conductor.
Top
#171107 - 11/19/07 06:51 PM Re: Current carrying conductor [Re: GTE]
Raymfl Offline
Member
Registered: 09/20/07
Posts: 12
Loc: Seminole County, FL
Originally Posted By GTE
Where in the code does it say that the grounded conductor of a 2-wire circuit is counted as a current carrying conductor?


Is this in reference to derating for the number of conductors in a conduit? If it is see 310.15(B)4


Edited by Raymfl (11/19/07 06:55 PM)
Top
#171123 - 11/20/07 05:22 AM Re: Current carrying conductor [Re: Raymfl]
ghost307 Offline
Member
Registered: 05/09/05
Posts: 900
Loc: Chicago Illinois USA
If the current travels to the load on the phase wire, the only path that it can use to get back to the source is the other conductor.
QED
_________________________
Ghost307
Top
#171134 - 11/20/07 10:23 AM Re: Current carrying conductor [Re: ghost307]
SteveFehr Offline
Member
Registered: 03/19/05
Posts: 1195
Loc: Chesapeake, VA
For a 2-wire circuit, the circuit is always going to be unbalanced, and the neutral considered a current carrying conductor per 310.15(B)(4)(a).


Edited by SteveFehr (11/20/07 10:23 AM)
Top
#171198 - 11/21/07 07:06 PM Re: Current carrying conductor [Re: SteveFehr]
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
No "Neutral" in a 2 Wire Circuit.

Same level of Current will flow on both Conductors -
(unless something is terminated incorrectly!..) shocked

The same applies to:
  1. L-N 120 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
  2. L-N 120 Volt 2 Wire Circuits, from a 3 Phase 4 wire Wye source,
  3. L-N 120 Volt 2 Wire Circuits, from a 3 Phase 4 wire Delta source,
  4. L-N 277 Volt 2 Wire Circuits, from a 3 Phase 4 wire Wye source,
  5. L-L 208 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
  6. L-L 208 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
  7. L-L 208 Volt 2 Wire Circuits, from a 3 Phase 4 wire source,
  8. L-L 240 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
  9. L-L 240 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
  10. L-L 240 Volt 2 Wire Circuits, from a 3 Phase 4 wire Delta source,
  11. L-L 480 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
  12. L-L 480 Volt 2 Wire Circuits, from a 3 Phase 4 wire source,
  13. L-L-L 208 Volt, 240 Volt and 480 Volt 3 Wire Circuits, from a 3 Phase 3 or 4 wire source.


Just wanted to make the subject clear.

Scott

BTW, I think it's time to draw up some basic circuit schematics, to demonstrate the flows + levels on 2 wire circuits
(also point out when a Common Grounded Conductor is a "Balanced Neutral", and when it isn't).
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 49 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
 
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals