GEC sizing

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charlie b

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Lockport, IL
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Not only no, but your question makes me wonder if you are considering adding up the area of all the ungrounded conductors to come up with a total cross-sectional area as the input to using 250.66. You don't have to do that either. It is generally the case that all the ungrounded conductors are the same size. The size of one of them is what you use for the table.
 

egurdian3

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Location
Germantown, MD
Not only no, but your question makes me wonder if you are considering adding up the area of all the ungrounded conductors to come up with a total cross-sectional area as the input to using 250.66. You don't have to do that either. It is generally the case that all the ungrounded conductors are the same size. The size of one of them is what you use for the table.

Thanks Charlie, my brain is frozen from the recent blizzard.
 

Dennis Alwon

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Chapel Hill, NC
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The only time 250.66 affects the neutral is when you are looking for the minimum size neutral allowed.

230.42(C) Grounded Conductors. The grounded conductor shall
not be smaller than the minimum size as required by
250.24(C).

This is from the 2014. The 20111 states 250.66--- same table just moved

250.24(C)(1) (1) Sizing for a Single Raceway. The grounded conductorshall not be smaller than specified in Table 250.102(C)(1).
 
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