May 2010 San Diego Infrastructure Deployment Guideline

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EVDRIVER said:
12G wire, seems a bit small.

That has to be a typo, you can't use a 40A circuit breaker with 12 gauge wire, that should be #8,
General guidlines:

#14 for 15A circuits
#12 for 20A circuits
#10 for 30A circuits
#8 for 40A circuits
 
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