grounded conductor allowed to be ran in a separate conduit from other conductors

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Klockopotomis

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Parker CO
I am doing a service change on an older house that had a 3 wire ran to the sub panel. I upgraded the sub panel and now the feed is not sufficient due to only being a three wire. Is it okay to run a new conduit on the outside of the house from the main panel to the sub with only a neutral inside? the existing feed was ran inside and is not accessible. Could you please include a code reference if possible? thanks
 
Klockopotomis said:
...Could you please include a code reference if possible? thanks
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Have a look at 300.3(B) and 300.3(B)(3)

(B) Conductors of the Same Circuit. All conductors of the
same circuit and, where used, the grounded conductor and all
equipment grounding conductors and bonding conductors shall
be contained within the same raceway, auxiliary gutter, cable
tray, cablebus assembly, trench, cable, or cord, unless otherwise
permitted in accordance with 300.3(B)(1) through (B)(4).

3) Nonferrous Wiring Methods. Conductors in wiring
methods with a nonmetallic or other nonmagnetic sheath,
where run in different raceways, auxiliary gutters, cable trays,
trenches, cables, or cords, shall comply with the provisions
of 300.20(B). Conductors in single-conductor Type MI cable
with a nonmagnetic sheath shall comply with the provisions of
332.31. Conductors of single-conductor Type MC cable with a
nonmagnetic sheath shall comply with the provisions of 330.31,
330.116, and 300.20(B).

 
thank you very much. I knew there was a reason I've never done it before. But when u work for a company and always do things their way I tend to question certain methods if they were just done a certain way for no reason or bc of code.
thanks
 
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