wrote in message
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Toller wrote:
wrote in message
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I have a 15amp circuit breaker from my main panel going to my garage
panel. The wire going to the panel to the garage is 10awg. I was
wondering if i could change that circuit breaker to a higher one. I
have a 220V heater that is 20 amps that keeps tripping the 15 amp
breaker on the main panel. Could I go to a 30amp breaker on the main
panel to the garage? On the garage panel there is 2 15amp circuits and
the 2pole 20amp circuit for the heater.

Probably. Naturally you will want to be certain there is nothing on the
circuit that can't handle 30a; though I can't think of what there could
be...
You also have to figure out how long the cable is, what the load is, and
the
voltage drop. Do a search on VD calculators.
If the only load on it is the heater and some lights, VD isn't all that
important. If you have motors or electronics, much more so.
In short, there could have been a good reason for the 15a breaker; make
darn
sure there wasn't before changing it.

The reason of the 15 amp breaker on the main panel was that when they
put in the garage panel it only had the 2 15amp circuits (one for the
lights and one for the outlets). I got the electrican to put in the
240V 20amp circuit a few years later for the heater. So would i need a
30amp circuit breaker going to the garage or could i go with a 20amp
breaker

You have to consider what I said above. If you have a very long cable run,
you could get bad voltage drop on big loads. A 20a breaker will stop you
from having big loads, and thus prevent VD. If your run is short, or you
don't care about VD, then a 30a breaker will be fine.

Now, I am saying that without seeing the circuit! I can't think of any
reasons that would prevent you from using a 30a breaker, but that doesn't
mean there aren't any that someone actually looking at it would see.

Your electrician was pretty dim to put a 20a heater on a 15a circuit.
Perhaps he did other dim things. (mostly covering my ass here, but it is
possible...)