ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Run Cap subsitution question. Two vs. one
by LarryC - 05/13/22 08:43 PM
Material shortages???
by NORCAL - 05/02/22 04:12 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 35 guests, and 12 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#171095 11/19/07 07:41 PM
Joined: Mar 2003
Posts: 48
G
GTE Offline OP
Member
Where in the code does it say that the grounded conductor of a 2-wire circuit is counted as a current carrying conductor?

Stay up to Code with the Latest NEC:


2020 NEC & Related Reference & Study Guides
2020 NEC & Related Reference & Study Guides
Pass Your Exam the FIRST TIME with these Exam Prep Combos:
 

>> Master Electrician Exam Prep     >> JourneyMan Electrician Exam Prep
 

Joined: Jan 2005
Posts: 5,316
Cat Servant
Member
Does it need to? It seems patently obvious that if you get a reading on an amp clamp, it's a current carrying conductor.

Joined: Sep 2007
Posts: 12
R
Member
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

Last edited by Raymfl; 11/19/07 10:55 PM.
Joined: May 2005
Posts: 984
Likes: 1
G
Member
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
Joined: Mar 2005
Posts: 1,213
S
Member
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).

Last edited by SteveFehr; 11/20/07 02:23 PM.
Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
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!

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Posts: 165
Joined: March 2007
Top Posters(30 Days)
LarryC 2
NORCAL 2
Popular Topics(Views)
291,226 Are you busy
223,730 Re: Forum
209,158 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5