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 <ev@lists.evdl.org
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 <ev@lists.evdl.org>
> 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
> >
> >
> >
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