PARALLEL NEUTRAL DERATING

G

Geoff23x

Member
Location
Lake City, FL
RUNNING PARALLEL 1/0 TO 120/208 200 AMP PANELBOARD RUNNING TWO VFD'S IN COMPRESSOR ROOM. NEEDS 5 LIGHTS TOTALING 7AMPS AND TWO 20AMP GENERAL PURPOSE RECEPTS. IM WANTING TO DERATE NEUTRAL TO #2. IM NOT SEEING WHERE I CANT DO IT. PLEASE PROVE ME WRONG.
THANKS
 
All caps is wild.

1/0 is the smallest you can run in parallel. 310.10(G).

If it is all in one conduit then you can run just one neutral conductor rather than two. Derating would apply.
 
Geoff23x said:
RUNNING PARALLEL 1/0 TO 120/208 200 AMP PANELBOARD RUNNING TWO VFD'S IN COMPRESSOR ROOM. NEEDS 5 LIGHTS TOTALING 7AMPS AND TWO 20AMP GENERAL PURPOSE RECEPTS. IM WANTING TO DERATE NEUTRAL TO #2. IM NOT SEEING WHERE I CANT DO IT. PLEASE PROVE ME WRONG.
THANKS
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Just curious, why the parallel conductors? Same or separate raceways? You can reduce the neutral in a feeder down as small as the 250.122 size, 215.2(A)(2). However you still have to comply with the 1/0 minimum for parallel installations (if these are parallel). If there is a single raceway, then yes you could run a #2 for the grounded conductor.
 
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