Neutral Size for Main Panel

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Old 11-11-06, 12:50 PM
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Neutral Size for Main Panel

Existing conductors to a 125 Amp main panel:

#2 CU - Load
#6 CU - Neutral

The calculated load for the panel is 107 Amps - is the size of the existing neutral OK...?

The A/C is fed directly from the outdoor load center, so I did not include it in the load calculations...

I have heard of a rule of thumb where it should be no less than 2 sizes under the load conductors...
 
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Old 11-12-06, 07:30 PM
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Location: Maryland
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Reduced neutral conductor size

You need to find out which hot conductor is carrying the largest amount of 120 volt loads. The neutral needs to be large enough for the larger of the two ungrounded conductors 120 volt loads because that is the largest load it may have to carry. Do not add up breaker settings because the resultant figure is meaningless. 240 volt loads do not subject the neutral to any additional current. So as long as the neutral is large enough to carry the larger of the actual 120 volt loads it will be fine.
 
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