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Old 06-12-2013, 11:18 AM   #1
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AC blowing breaker in coach

SO it was 97 yesterday when I got home. The Coachmen is sitting in the cul-de-sac between trips and was 104 inside (DW closed all the windows vents etc., as it was thundering at 5:30 am but never rained).

Then found out the neighbor's A/C was out. Wanted to offer the camper to them, but I was uncertain if the A/C would run off the house. I have it plugged into a 20 amp run in the garage, but with 100ft of regular outdoor extension cord (not the heavy 30 amp cord) I sincerely doubted I was going to get enough juice out to the camper to urn the A/C. Went ahead and turned it on anyway.

It ran for about 10 minutes, and then blew the breaker inside the camper. Not the house...

This confused me. I would assume the 20 amp breaker in the camper would allow the A/C to pull 20 amps through it. Since I had at max 20- amps hitting the camper, and probably less, I assumed the weakest link was the breaker in the house.

The more I thought about it, the more I thought maybe the breaker in the camper is the problem. We have only ru the A/C a couple times, just have not been in hot weather, yet. I tried it again after letting it sit for a while and did the same thing. By that time the camper had cooled off a little from all the windows open and dinky little fan in the bathroom running.

Any thoughts as to why the A/C breaker in the camper blew but not the supply breaker?
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Old 06-12-2013, 11:29 AM   #2
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What size cord and how long.

Cord should say awg rating on it
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Old 06-12-2013, 11:31 AM   #3
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cords are your standard home depot outdoor extension cord. 16/3 - 2 50 ft cords.
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Old 06-12-2013, 11:32 AM   #4
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This will help.

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Old 06-12-2013, 11:35 AM   #5
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As seen you need at least 12 ga ext cord no longer than 50'

Standard cords are 16 -18 ga.


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Old 06-12-2013, 11:38 AM   #6
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those posts suggest that no way am I getting 20 amps, or close to it, to the camper...which makes me wonder even more why the breaker would blow. As I understand it, breakers blow when overloaded, not under loaded, right?
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Old 06-12-2013, 12:18 PM   #7
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Quote:
Originally Posted by jeeplj8 View Post
those posts suggest that no way am I getting 20 amps, or close to it, to the camper...which makes me wonder even more why the breaker would blow. As I understand it, breakers blow when overloaded, not under loaded, right?
My point is if you have a 16-18 ga cord @ 100' then that cord will not carry the amps required to run your ac therefore heating up breaker and tripping it.
Cord is prolly hot to!

The hoter it gets outside the more amps the a/c will require.

A 50' 12 ga cord would be at the least minimum.
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Old 06-12-2013, 12:20 PM   #8
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Dometic Fridge.....


Read towards end.
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Old 06-12-2013, 12:21 PM   #9
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Originally Posted by f1100turbo View Post
My point is if you have a 16-18 ga cord @ 100' then that cord will not carry the amps required to run your ac therefore heating up breaker and tripping it.
Cord is prolly hot to!

The hoter it gets outside the more amps the a/c will require.

A 50' 12 ga cord would be at the least minimum.
there is what I was missing, so the breaker will blow in an under-current situation?!? Now it makes sense.

Looks like 100 ft of 10/3 is $133 at Home Depot...oh boy.
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Old 06-12-2013, 01:00 PM   #10
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Originally Posted by jeeplj8 View Post

there is what I was missing, so the breaker will blow in an under-current situation?!? Now it makes sense.

Looks like 100 ft of 10/3 is $133 at Home Depot...oh boy.
Now your talkin!
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