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Joined: Mar 2003
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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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Joined: Jan 2005
Posts: 5,445 Likes: 2
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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.
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Joined: Sep 2007
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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.
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Joined: May 2005
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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
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Joined: Mar 2005
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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.
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Joined: Oct 2000
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No "Neutral" in a 2 Wire Circuit. Same level of Current will flow on both Conductors - (unless something is terminated incorrectly!..) The same applies to: - L-N 120 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
- L-N 120 Volt 2 Wire Circuits, from a 3 Phase 4 wire Wye source,
- L-N 120 Volt 2 Wire Circuits, from a 3 Phase 4 wire Delta source,
- L-N 277 Volt 2 Wire Circuits, from a 3 Phase 4 wire Wye source,
- L-L 208 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
- L-L 208 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
- L-L 208 Volt 2 Wire Circuits, from a 3 Phase 4 wire source,
- L-L 240 Volt 2 Wire Circuits, from a 1 Phase 3 wire source,
- L-L 240 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
- L-L 240 Volt 2 Wire Circuits, from a 3 Phase 4 wire Delta source,
- L-L 480 Volt 2 Wire Circuits, from a 3 Phase 3 wire source,
- L-L 480 Volt 2 Wire Circuits, from a 3 Phase 4 wire source,
- 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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Posts: 28
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