On 20 Jan 2016 at 8:03, Mike Nickerson via EV wrote:

> You could have a 15A
> outlet with 20A wiring, but I wouldn't try to draw 16A from it.  While the
> wiring could take it, the outlet isn't rated for it.

If you take two "commercial duty" receptacles apart, one rated 15a and the 
other 20a, you won't see any difference in them.  

I haven't tried this with the 15a recepts from the 50 cent baskets at the 
big box stores, however.  My suspicion is that with new ones you can draw 16 
amps all day.  With 20 or 30 year old cheapo receptacles, I wouldn't 
recommend it.

Broadly speaking, if the left slot (with ground pin down) is T-shaped, it's 
a 20a rated 120v recept, and you can use up to 16a for charging.  Otherwise, 
limit your charging to 12a.

I can't think of any way to determine the receptacle's capacity 
electronically, without tripping the breaker or blowing the fuse.  I'm not 
an engineer, though.

David Roden - Akron, Ohio, USA
EVDL Administrator

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