12 awg on 15 amp breaker isn't bad but yes you are right 14 awg on 20 amp breaker would be an issue
A little harsh don't you think? Yes, 14ga wire should be protected at 15A, but 14ga wire will carry 20A all day every day without "melting". It's the insulation that may suffer damage from overheating.12/2 is rated for 20A, so it's perfectly ok (but maybe wasteful material wise) to put it on a 15A or 20A breaker.
14/2 is of course only rated 15A, you put it on a 20A breaker and draw maybe 18A through, and the wire will start to melt while the breaker keeps on truckin, turning your house into a toaster
Not a problem - the electrician may have upsized the home runs for voltage drop - or just likes wasting copper.Hi guys,
Most of my house is wired with 12-2. Some of the breakers are 20 but a lot are 15amp? Is this a problem? Or would it be a problem if it were like 14 guage wire on a 20amp breaker?
I am not very familiar with the CEC, but that sounds suspect, especially for a heating load. I suggest you check that again. I am not saying you are wrong, but it sounds odd that a resistive load would be allowed to have an oversize breaker.Just FYI, there is situations that you may see a smaller wire then what the breaker is(i.e #14 on a 20A breaker) Air conditioning is one example, the breaker may be upsized for the inrush at starting. In Canada(not sure about the US) pure heating loads(baseboards, electric furnaces) are wired to the load but the breaker is upsized for continours use. So in that case you could see a #12 on a 30A breaker, probably not common but is legal.
Yes the Code allows for a few instances of oversizing the breaker compared to wire size. Motors and HVAC compressors can have oversized breakers in certain circumstances.Not sure about here in the us. I think you must have the breaker 15 for 14awg. If you need a 20 for inrush, 12 is the way to go.
There are breakers designed for motor start devices. HACR breakers are for heating, air conditioning, and refrigeration units.