Correct, a 240v circuit can overload one leg and the ganged breakers will trip. That is why it has a pair of ganged breakers. Cor.
On Sun, Feb 17, 2019, 7:41 PM Robert Bruninga via EV <[email protected] wrote: > Thanks for your insight. Yes, the breaker will be 20 amps so if anyone > tries to do anything other than a single L2 or two L1's they will loose > both as the breaker will trip. I do assume that a 20A 2 pole breaker > actually will trip based on an overload on either of the two sides > independently of what is on the other. > > Thanks! > Bob > > > On Sun, Feb 17, 2019 at 7:32 PM Jay Summet via EV <[email protected]> > wrote: > > > > > > I install two 120v outlets on each post along with a single 240v > outlet. > > > And then a small note says, "Either one L2 or two L1's but not both". > > > Each post has properly rated #10 conductors for the 16 amps on Line1 > and > > > Line2 and Ground and a #12 for Neutral since the Neutral carries either > > > zero or only the 12 amps of a single L1. > > > > > > > > > Is this legal under the NEC? > > > > It depends entirely upon your breaker size. As long as you don't have a > > breaker larger than 20 amps on either phase you should be good to go. > > > > I'm worried about you sizing the neutral smaller than the hots, as > > somebody may see the 10 AWG hot line and put a 30 amp breaker on it, not > > realizing the neutral wire still needs to be limited to 20 amps. > > > > I'm also worried about the ability for somebody to overload one of your > > hots by plugging into both the L2 and an L1 at the same time. > > > > A polite sign isn't the same as an interlock. You must assume some bozo > > will plug into the L2 and both L1's at the same time. > > > > (I assume the two 120v L1 outlets are on opposite phases of a split > > phase 240 setup for the 240v outlet.) > > > > For example, if somebody sets up a space heater that draws 15 amps on > > one of the L1 outlets, and then somebody else starts to charge their car > > at 16 amps on the 240 outlet, the total number of amps on one of your > > hots would be 31 amps, which is more than should be going over a 10 AWG > > wire. If you had a 20 amp breaker no problem. If you are using a 30 > > amp breaker, no problem for the 240 volt circuit, but somebody could > > successfully draw 25 amps over your 10 AWG neutral if they (for example) > > had a 30 amp 120v RV circuit going through a 15 amp plug adapter. > > > > So either the breaker must trip because it's a 20 amp, or all the wires > > including the neutral must be sized to accommodate the full possible > > load, 10AWG for a 30 amp breaker. > > > > Jay > > > > > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > Please discuss EV drag racing at NEDRA ( > > http://groups.yahoo.com/group/NEDRA) > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190217/6e45c515/attachment.html > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190217/c25057e1/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
