Good Sam Club Open Roads Forum: Class A Motorhomes: Campground Breakers - EDITED
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 > Campground Breakers - EDITED

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rgatijnet1

Florida

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Posted: 07/13/19 07:42am Link  |  Print  |  Notify Moderator

You were in an RV park. It was hot and lots of others were using their AC's as well. This probably caused a voltage drop in certain portions of the RV park.
As the voltage drops the current draw goes up. As the current increased because of the voltage drop this may have tripped marginal circuit breakers

wanderingaimlessly

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Posted: 07/13/19 07:44am Link  |  Print  |  Notify Moderator

If you have a means, check voltage inside when you are starting the AC units. Breaker may be fine if the line voltage has dropped 10% or more because everyone is running a lot of AC units.
Remember, as voltage drops, amp draws increase accordingly.

rk911

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Posted: 07/13/19 07:57am Link  |  Print  |  Notify Moderator

we had a similar situation a few years back at a KOA in ohio. long story short the CG worker replaced the breaker and service returned to normal. nothing lasts forever.


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DrewE

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Posted: 07/13/19 10:36am Link  |  Print  |  Notify Moderator

Assuming there was nothing else of significance consuming power in the RV, there is no realistic way two air conditioners should trip a 50A breaker on their own. If their current consumption is abnormally high, the 20A breaker for the air conditioner circuit(s) would trip long before a properly functioning 50A breaker. That ought to be true even if both air conditioners are on the same leg, which is not the way things ought to be wired up.

If a bunch of other stuff is running at the same time, say an electric water heater element and the converter charging rather low batteries and the fridge and maybe the microwave oven, then one may be able to legitimately exceed 50A and cause a healthy breaker to trip as it ought.

(Incidentally, the suggestion that current always goes up when voltage goes down is absolutely incorrect for many loads. Electric motors and motor-driven equipment is a rather complicated case; the current may go up, down, or stay the same, at least within some reasonable range of voltages. If the voltage drops low enough, the current will of necessity go down; otherwise you'd have the air conditioner etc. consuming inifinte current when unplugged with the generator off! For resistance heaters and incandescent lights, the current (and hence power consumed) drops as voltage drops.)





DutchmenSport

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Posted: 07/13/19 10:58am Link  |  Print  |  Notify Moderator

Simple answer, yes .... breakers do wear out if tripped and/or flipped on and off a lot. (some are more resilient to off-on / and-or / being blown where others are not.) Age and wear does play a factor.

USAFBILL

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Posted: 07/13/19 10:59am Link  |  Print  |  Notify Moderator

Breakers do de-rate as they age and repeated tripping,,,,

Lwiddis

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Posted: 07/13/19 11:36am Link  |  Print  |  Notify Moderator

“so you could tell management, or the electrician”

Management and the electrician DON’T want to change it. They don’t care that it trips.


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Chum lee

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Posted: 07/13/19 12:27pm Link  |  Print  |  Notify Moderator

DutchmenSport wrote:

Simple answer, yes .... breakers do wear out if tripped and/or flipped on and off a lot. (some are more resilient to off-on / and-or / being blown where others are not.) Age and wear does play a factor.


Yep! Male and female receptacles/plugs wear out/break too. From electrical engineering 101: LCL or Long Continuous Loads require that conductors/circuits be derated for reliable service in continuous highly loaded conditions. (like what is happening in this case) 50 amps doesn't always mean 50 reliable amps. (2 circuits in this case)

Chum lee

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Posted: 07/13/19 02:31pm Link  |  Print  |  Notify Moderator

DrewE wrote:

(Incidentally, the suggestion that current always goes up when voltage goes down is absolutely incorrect for many loads. Electric motors and motor-driven equipment is a rather complicated case; the current may go up, down, or stay the same, at least within some reasonable range of voltages. If the voltage drops low enough, the current will of necessity go down; otherwise you'd have the air conditioner etc. consuming inifinte current when unplugged with the generator off! For resistance heaters and incandescent lights, the current (and hence power consumed) drops as voltage drops.)
Wow - You are one of the very very few who understand this.


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DownTheAvenue

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Posted: 07/13/19 02:33pm Link  |  Print  |  Notify Moderator

DrewE wrote:

(Incidentally, the suggestion that current always goes up when voltage goes down is absolutely incorrect for many loads. Electric motors and motor-driven equipment is a rather complicated case; the current may go up, down, or stay the same, at least within some reasonable range of voltages. If the voltage drops low enough, the current will of necessity go down; otherwise you'd have the air conditioner etc. consuming inifinte current when unplugged with the generator off! For resistance heaters and incandescent lights, the current (and hence power consumed) drops as voltage drops.)


In other words, Ohm's Law is not a fact. WOW! I did not know that. Thanks for posting this new relevation!

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