PARALLEL PHASE CONDUCTORS MUST ALSO HAVE PARALLEL GROUNDED CONDUCTOR

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amazing electric

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Hi, got this correction on a duplex where we ran 2 parallel sets of 4-0 for phase and ran a single conductor for neutral , my understanding is parallel grounded conductors are required if phase parallels are in different conduit , am I wrong?? Thank you
 
300.3(B) is where you need to start reading the requirements here. It does also refer you to requirements in 310.10(H).
 
amazing electric said:
Hi, got this correction on a duplex where we ran 2 parallel sets of 4-0 for phase and ran a single conductor for neutral , my understanding is parallel grounded conductors are required if phase parallels are in different conduit , am I wrong?? Thank you
Click to expand...
Parallel raceways require a neutral in each raceway per second sentence of 300.3(B)(1):
The requirement to run all circuit conductors
within the same raceway, auxiliary gutter, cable tray, trench,
cable, or cord shall apply separately to each portion of the
paralleled installation, and the equipment grounding conductors
shall comply with the provisions of 250.122.
Click to expand...
 
amazing electric said:
Hi, got this correction on a duplex where we ran 2 parallel sets of 4-0 for phase and ran a single conductor for neutral , my understanding is parallel grounded conductors are required if phase parallels are in different conduit , am I wrong?? Thank you
Click to expand...

If it's only one raceway then the neutral needs to be sized according to the load calculation and it could be a single conductor.
 
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