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Old 03-03-2011, 09:41 AM   #1
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Loud Humming

My Electrical box in wall cabinets in the bedroom of my 1990 Crown Royale makes an excessive loud humming sound !

I am thinking that this not normal. I have noticed it since my purchasing it in 6/2010. Everything works fine, just a loud humming. Heard from outside if walking around MH also.

Any ideas
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Old 03-03-2011, 10:02 AM   #2
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It may be a 60 HZ hum but the breaker box should not do that. However if you have an inverter/converter nearby then that would not be unusual.
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Old 03-03-2011, 10:32 AM   #3
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On my previous MH my converter was located in a basement storage compartment under the bedroom. It hummed and kept my wife awake at night. I tightened the mounts and it stopped a lot of the humming. A circuit breaker panel should not hum and if it does then you have a bad circuit breaker or a loose screw connector.
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Old 03-03-2011, 11:17 AM   #4
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My convertor hums... its under the bed.
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Old 03-03-2011, 12:11 PM   #5
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Some electrical boxes do indeed contain the converter, Some do not (mine is a goot 15 feet from the box)

Questions: A: are the fuses and breakers behind the same door, or are there two doors

If different; Stop and go to next reply

If same: IS there a label on the door listing the make and model of the box (May be on inside)

If yes; What make and model

Thank you
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Old 03-03-2011, 12:23 PM   #6
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I have a rear bedroom where hummin is coming from. My inverter is in the basement compartment just about 12" from the center line [40'er] of MH. All breaker switches in box are good as far as I can tell. Not tripped or anything like that.
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Old 03-03-2011, 12:26 PM   #7
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Quote:
Originally Posted by wa8yxm View Post
Some electrical boxes do indeed contain the converter, Some do not (mine is a goot 15 feet from the box)

Questions: A: are the fuses and breakers behind the same door, or are there two doors

If different; Stop and go to next reply

Thank you
They are in two different cabinets.
What 'next reply' are you talking about.
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Old 03-03-2011, 12:28 PM   #8
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Quote:
Originally Posted by Mike Canter View Post
It hummed and kept my wife awake at night. I tightened the mounts and it stopped a lot of the humming. A circuit breaker panel should not hum and if it does then you have a bad circuit breaker or a loose screw connector.
Do you think that if I mounted the boxes on a rubber washer or backing, it should stop the humming?
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Old 03-03-2011, 12:30 PM   #9
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After posting that last reply, thinking about it, no it won't stop the humming or solving my problem, it will just LESSEN THE VIBRATION caused by sounding thruout the MH from being in DIRECT CONTACT with the problem.
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Old 03-03-2011, 12:37 PM   #10
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I can hear my converter hum slightly, its 15 feet from my bed head, not bad enough to bother me. Rubber mounts added will take almost ALL noise away. Spring project.
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Old 03-04-2011, 05:31 AM   #11
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2 boxes in cabinet

In one of the cabinets mentioned is a shore power electrical breaker switch box [big] which takes up whole cabinet. Other cabinet by side of it contains 2 electrical boxes. One is a small fuse box similar to the big one under my dash, and the other one is a big box with 4 something or other objects in it with wires [ac electric wires] going every which way. I am assuming this is my converter box. This is the box that is humming. My inverter box in the basement as mentioned previously.
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Old 03-04-2011, 06:13 AM   #12
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Quote:
Originally Posted by OnJa View Post
In one of the cabinets mentioned is a shore power electrical breaker switch box [big] which takes up whole cabinet. Other cabinet by side of it contains 2 electrical boxes. One is a small fuse box similar to the big one under my dash, and the other one is a big box with 4 something or other objects in it with wires [ac electric wires] going every which way. I am assuming this is my converter box. This is the box that is humming. My inverter box in the basement as mentioned previously.
Well that may be your AC transfer switch. If the wire going in is 10 gauge or lower that may be it. If the wire going in is 12 or higher then it may be your converter. Do you know if your inverter is only that and not a combination inverter/converter? It is not unusual for a transfer switch with AC coils to chatter. Does it chatter (hum) if you are running your genset as well? Lastly the rubber bushings is not a bad idea for cutting out some sound/vibration. I'd better qualify: Chatter is the result of transfer switch contacts not seated perfectly and may need to be cleaned with burnishing tool. The hum is the sound of 60 HZ ac over the coils of the transfer case.
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