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Current carrying conductor #171095 11/19/07 06:41 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?

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Re: Current carrying conductor [Re: GTE] #171099 11/19/07 08:44 PM
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renosteinke Offline
Cat Servant
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Does it need to? It seems patently obvious that if you get a reading on an amp clamp, it's a current carrying conductor.

Re: Current carrying conductor [Re: GTE] #171107 11/19/07 09:51 PM
Joined: Sep 2007
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Raymfl Offline
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 09:55 PM.
Re: Current carrying conductor [Re: Raymfl] #171123 11/20/07 08:22 AM
Joined: May 2005
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ghost307 Offline
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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
Re: Current carrying conductor [Re: ghost307] #171134 11/20/07 01:23 PM
Joined: Mar 2005
Posts: 1,213
S
SteveFehr Offline
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 01:23 PM.
Re: Current carrying conductor [Re: SteveFehr] #171198 11/21/07 10:06 PM
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Scott35 Offline
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!

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