Another image added to the free Gallery: Sizing Conductors: Overcurrent Protection and AWG Cable

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This should be changed to indicate this is for branch circuit conductors. SE and feeder conductors don’t necessarily follow this chart.


Done: Sizing Conductors: Overcurrent Protection and AWG for Branch Circuits - Inspection Gallery - InterNACHI®


This is assuming conductors used at their 60 degree ampacity in a cable like NM. A cable like MC or THHN in a conduit could use different sizes.

A note to say that this does not apply to motor or HVAC loads would be helpful also.

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There is also an issue with the larger sizes. Example, 4/0 Al is only good for a 200 amp service which allows the conductors to be sized at 83%. A 200 amp circuit would need larger conductors.

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