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Old 06-26-2021, 06:10 AM   #1
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Low Voltage from Circuit Breaker

I have an Intellitec Service Panel with Murray circuit breakers.

I'm plugged into a 15amp shore power outlet (at home) and one 20a breaker shows 107v when I meter it however the other 20a breaker only shows 3v.

The breaker isn't tripped. The replacement breaker comes in two types one of which is called a non-current limiting. Unfortunately the Model number on it, MP2020, doesn't discern which type so when I look at the now-defunct Murray breakers a Siemens is an option but which one.....non-current limiting?

Thanks
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Old 06-26-2021, 06:16 AM   #2
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Swap the breakers if you can and see if the problem follows. A breaker is likely broke if it doesn't pass voltage. It just does not add up. Might be the fingers have spread on the breaker an not making contact.
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Old 06-26-2021, 06:23 AM   #3
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BTW, do NOT run any high amp appliance such as roof air on a starting voltage of 107 VAC. If that is the no-load voltage, very likely to drop even lower under load and that can burn up motors.
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Old 06-26-2021, 06:40 AM   #4
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Your 15a hookup is only powering half of your panel.
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Old 06-26-2021, 06:40 AM   #5
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Quote:
Originally Posted by wolfe10 View Post
BTW, do NOT run any high amp appliance such as roof air on a starting voltage of 107 VAC. If that is the no-load voltage, very likely to drop even lower under load and that can burn up motors.
That reading of 107v is taken when the AC unit was running.
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Old 06-26-2021, 06:43 AM   #6
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Quote:
Originally Posted by Big Bear Local View Post
Your 15a hookup is only powering half of your panel.
Hrmmm....is that by design or just a coincidence. If I run the generator, Onan 5500, it should power the entire panel and both 13.5 AC units should work?

I ask as I can't test right now as I have to put a new fuel filter on the generator.

Thanks...
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Old 06-26-2021, 06:48 AM   #7
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Originally Posted by Big Bear Local View Post
Your 15a hookup is only powering half of your panel.

To know that, we need to know if the RV is 30 amp or 50 amp.


If 30 there IS only one hot.


If 50 the 30 male to 50 female adapter should connect the single hot in the 30 end to BOTH hots in the 50 end.
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Old 06-26-2021, 06:53 AM   #8
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To know that, we need to know if the RV is 30 amp or 50 amp.


If 30 there IS only one hot.


If 50 the 30 male to 50 female adapter should connect the single hot in the 30 end to BOTH hots in the 50 end.
The RV is 50amp
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Old 06-26-2021, 11:27 AM   #9
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CL – Current Limiting is a mechanical design that prevents the use of some tandem breakers which may lead to exceeding the number of circuits that can be connected to the panel which could lead to an over current condition.

NCL– Non-Current Limiting is where the design of the panel will allow the use of tandem circuit breakers however you may not exceed the maximum number of circuits as specified by the panel.


Buy the Siemens NCL tandem 20A CBs and replace the old Murray CBs
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Old 06-26-2021, 11:45 AM   #10
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OK, with 15 amp shore power and 50 amp RV, here are your adapters:


15 amp male to 30 amp female.


30 amp male to 50 amp female.


Yes, there are some direct 15 amp male to 50 amp female, but rare. And, electrically, they do exactly the same as the 15/30 and 30/50.


In any standard 30 amp male to 50 amp female, the single hot in the 30 amp end is connected to BOTH hots on the 50 amp end.


All this is very easy to verify with an ohmmeter/voltmeter.


No way for only one side of the RV to be powered unless you have either a defective adapter or someone has otherwise "monkeyed" with the electrical system.
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Old 06-26-2021, 12:52 PM   #11
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Ok, it could well be that the 30 to 15 adapter is an issue. After installing a new fuel filter in the Onan it's working fine and now when I checked the service panel with the generator running:

1. The bottom breakers below where the power comes into the panel register 120v as they did without the generator

2. The breakers above also NOW register 120v with one exception. The 20a breaker for AC2 registers .1v and when as soon as I flick the breaker to the ON position the generator stalls. That breaker does not trip though.

So the 30 to 15 adapter aside for now, if that 20a breaker for AC2 is bad could it cause the generator to stall like that? Of note, that breaker is a tandem 20a. The other 20a part of it that feeds Small Appliance circuit does register the 120v.
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Old 06-26-2021, 04:37 PM   #12
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Check grounds and neutrals on all the breakers with all power off.
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Old 06-27-2021, 05:47 AM   #13
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A new tandem 20a breaker arrives tomorrow so I'll keep my fingers crossed when I put it in I'll get some voltage. From everything I've read, if all the other breakers have 120v when I meter them and that one gives .1 to .3v the breaker is bad.
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