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Old 06-21-2024, 06:10 AM   #1
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Main breaker

Why would my 29MV have a 15 amp main instead of 30? Thanks
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Old 06-21-2024, 09:04 AM   #2
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Two possibilities.

First, is that you are not identifying the main breaker correctly and you actually have a 30A breaker.

Second is that someone replaced the 30A breaker with a 15A breaker (for some unknown reason).

~CA
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Old 06-21-2024, 11:04 AM   #3
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According to the legend the main is the top breaker and labeled main. It has a 15 amp breaker. All other breakers have 2 switches the main is 1 switch and is 15 amp
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Old 06-21-2024, 11:40 AM   #4
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Could you post a picture of the ac panel?
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Old 06-21-2024, 12:26 PM   #5
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Will do in a bit when service better
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Old 06-21-2024, 03:03 PM   #6
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Dunno if this helps, but here's mine on a 2016...
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Old 06-21-2024, 03:08 PM   #7
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Well, I'll be. Mine looks like it was a 15A Main too???
The converter has 30A.
Or am I reading the legend wrong?
Upside down???
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Old 06-21-2024, 03:59 PM   #8
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If there is a breaker that is 30 amp, it is the main breaker. There would be no reason to put in a 15 amp main and a 30 amp branch breaker.

In any event, this is a very easy thing to troubleshoot. Forget what the diagram says and just turn off one breaker at a time and see what goes off. If you turn off the 15 amp breaker and everything goes off, it may be time to have an electrician look at it. Did someone change out the main for a 15 amp one due to a failure of the 30 amp one? Who knows.

The main breaker is connected to have power feed it and then its output is connected to all other breakers in the panel. Caveat - if you are running 30 amp service using a panel that can do 50 amp, the main breaker only feeds 1/2 of the panel. That is what is in my rig. 1/2 of the breaker possible positions can't be used as they are connected to what would be the other leg of a 50 amp feed.
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Old 06-21-2024, 05:11 PM   #9
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I'd have a tendency to be more concerned about the 20A breakers. You know that the 30A is the main in spite of the ambiguous labeling. My 2015 Greyhawk is wired with all #14 wire which should have no more than a 15A breaker. I know this because I changed out a couple of breakers to be 20A and then realized that the rig was only wired with #14 . I immediately replaced the breakers with the originals.
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Old 06-21-2024, 05:59 PM   #10
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Well, I'll be. Mine looks like it was a 15A Main too???
The converter has 30A.
Or am I reading the legend wrong?
Upside down???
"It" is upside down.

I used the word "It" on purpose, as "it" could be the label or perhaps the entire panel is upside down.

Or perhaps the person installing and connecting the breakers was looking at the label from an upside down position.

Not that either would worry me. ~CA
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Old 06-21-2024, 08:30 PM   #11
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Very simple to tell. Turn off the 15 amp that you think is the main, and see if your microwave light goes out. If yes, then the 15 is the main. If no, then the 15 is not the main. No tools.
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Old 06-21-2024, 09:01 PM   #12
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We have 20a with 14g wire in our home for the refreg circuit. All the homes in my neighborhood and its code.
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Old 06-21-2024, 09:10 PM   #13
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We have 20a with 14g wire in our home for the refreg circuit. All the homes in my neighborhood and its code.
Unless your area has adopted an ordinance saying that, of have written their own code, like NYC or Chicago, I beg to differ. The NEC (National Electrical Code) and the specifically says that #14 is minimum for 15 ampere circuit and #12 is minimum for 20 amp circuit. If you need proof, I can tell you where it is in the NEC.
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Old 06-21-2024, 09:15 PM   #14
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Thank you all. I have enough to figure it out now. Need to wait till out of this camp area. Not much wireless. Thanks again!!!
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Old 06-21-2024, 11:47 PM   #15
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Very simple to tell. Turn off the 15 amp that you think is the main, and see if your microwave light goes out. If yes, then the 15 is the main. If no, then the 15 is not the main. No tools.
That sir, is a really good idea!
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Old 06-21-2024, 11:48 PM   #16
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"It" is upside down.

I used the word "It" on purpose, as "it" could be the label or perhaps the entire panel is upside down.

Or perhaps the person installing and connecting the breakers was looking at the label from an upside down position.


LOL. If this was a Covid camper, I'd be more understanding.

I'll do what Kevin suggested and flip one and see what goes out.
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Old 06-22-2024, 08:02 AM   #17
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LOL. If this was a Covid camper, I'd be more understanding.

I'll do what Kevin suggested and flip one and see what goes out.
I suspect the label is simply upside down in arrangement. Looking at your breakers image again, there is no way with using those exact breakers and with the orientation of the panel to have the 30A breaker on the top, so they put it on the bottom. I wonder if the other breakers are correct in order as labeled though. ~CA
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Old 06-22-2024, 08:23 AM   #18
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The label is correct orientation, the breaker locations are the offender. The AC and the Microwave are most likely the two 20 amp breakers. Just can’t figure out which one is missing. Could be inverter or utility.
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Old 06-22-2024, 08:48 AM   #19
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The label is correct orientation, the breaker locations are the offender. The AC and the Microwave are most likely the two 20 amp breakers. Just can’t figure out which one is missing. Could be inverter or utility.
The "label" orientation is correct but the items listed (the labeling) on the label are not (I suspect they are listed in order starting from bottom up instead of top down). Keep in mind that with only using the breakers installed, and maintaining the panel orientation, there is no way to reposition the breakers and have the 30A breaker on top so they likely started from the bottom and worked their way up. (the 30A main is a tandem breaker and cannot be separated from the 15A breaker that it is in tandem with).

If you start at the bottom of the panel and work your way up (following the label going down), you have main 30, refer 15, utility 15, A/C 20, inverter 15, Microwave 20, converter 15.

Having said that, I wouldn't suggest to anyone to trust that the breakers are listed in order and instead I would check for voltage prior to working on anything like the A/C for example. ~CA
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Old 06-22-2024, 09:14 AM   #20
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Just another thought, I wouldn't worry about it if it was my RV. However, if someone was to hire me to correct this issue or if I did want to correct a labeling mismatch in my RV (if there was one). Then this would be the tool I would use. ~CA
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