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hi .........it sounds like you have a short somewhere ............are these old work or new work cans?.........can you go back and test all your connections and switch(es)?..........it is arcing that is why you are hearing a buzz ............the last thing it could be is a faulty breaker
how much did you add to the circuit and what was on it before ..........it could be that you are overloading it
so you are adding 5 more lights 2 more switches.....this is already about 12 amps.................believe it or not but a ceiling fan should be on a dedicated circuit because it has a motor...but not too big a deal.........and then the bathroom 2 more lights? light/exhaust fan combination? GFCI?
Hello my name is***** like to try to help.
Turn all devices off that are on that 15 amp circuit and turn the breaker back on
Then you can turn on one light or fan at a time and see if the breaker trips. Remember to turn off each light or fan after the test.
If nothing trips the breaker this way, then you can start combining loads...
if the breaker trips due to having too much load you will have to consider tapping another circuit..or running new
hmm, you eliminated the switched receptacle...that is going to be a 3 wire from the switchbox. red/black/white/bare
that sounds good, i was thinking double fed on something...
does the breaker make any sound before its trips?
if so it may be faulty, they can go bad if repeatedly tripped
try putting your main circuit feed on another 15 amp breaker and see if it will hold it...
...usually bathrooms are on 20 A circuits...were you able to determine the wire gauge?
when you say you didnt have any load on the circuit how are you sure of this?
if the breaker switch does not fix it you have either
oh wow, these z wave dimmers need a neutral
you have plenty of opportunity for a mix up thats for sure
were any of the new switches 3 way?
there is the wiring diagram just for fun
there are a lot of variables here, its going to take a load calculation and checking each splice in the circuit to find the problem
i am recommending you call an electrician. This is one of those deals where someone is going to have to get their hands dirty..