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Old 05-20-2013, 05:29 AM   #1
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Campground 30A Blowing?!

When we first connected to the campground 30A circuit, we could run both a/c, convection/microwave. then after cooking a prime rib in the convection oven, the 30a popped. since then, it's gotten progressively worse - now we can only run 1 a/c alone for about 10-15 min. if we run the convection by itself, it'll run for a little while. the campground replaced the 30A breaker with no better results. the only thing I've noticed so far is that the plug for my 50a cable gets pretty hot, the rest of the cable is cool as a cucumber. any ideas?
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Old 05-20-2013, 05:40 AM   #2
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I would start with the 50a cable end, any corrosion or evidence of burning?
Same would apply to the campground supply box.

Bob
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Old 05-20-2013, 06:31 AM   #3
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Will your cord reach over to a box on an adjacent site to see if it blows? If not, how much trouble is it to move to another site? It may help to see where the problem is.
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Old 05-20-2013, 06:43 AM   #4
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Will your cord reach over to a box on an adjacent site to see if it blows? If not, how much trouble is it to move to another site? It may help to see where the problem is.
Joe

Da, Bob...now that's an even better place to start....

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Old 05-20-2013, 06:58 AM   #5
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are you trying to draw 50 amps through a 30 amp outlet?
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Old 05-20-2013, 07:15 AM   #6
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i'm not trying to draw 50a, the only way I know to verify that is to put a clamp on ammeter. but the original mystery is why I could run both a/c and microwave/convection and now I can even run either 2 a/c or an a/c and microwave/convection. i'm guessing what i'll try is to replace the hot 50a plug in case it's drawing current and turning it into heat?
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Old 05-20-2013, 07:18 AM   #7
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... the only thing I've noticed so far is that the plug for my 50a cable gets pretty hot, the rest of the cable is cool as a cucumber. any ideas?
Wherever there is a junction, there will be some resistance that translates to heat. More resistance = more heat. Look at your plug for signs of corrosion or pitting. They probably replaced the breaker assuming it had become weak, but the problem may reside in the outlet itself (loose connections/corroded or pitted contact surfaces). As previously suggested, moving to a different outlet may reveal if the problem is theirs or yours. Running 1 A/C plus fridge and converter should not be tripping a 30a breaker.

It is good practice to switch off the post breaker before attaching or removing the plug. This prevents arcing and pitting of the plug and socket. This is frequently not done and while your plug may be pristine, the socket may have suffered years of abuse and is junk.
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Old 06-01-2013, 09:17 AM   #8
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I think I finally stumbled on the problem. The engine block heater was on. So far, with this off I can run both a/c, water heater, 2 tv, oven! Is there a fuse/breaker I can pull so "we" don't flip this switch again?
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Old 06-01-2013, 08:49 PM   #9
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Are you not concerned that you might need that block heater in Florida?

Your breaker box should show each breaker's description. Chances are, the engine heater is not on its own circuit. Do you not have an indicator light on the switch when it is on? If not, might be worthwhile updating to one.

Dave
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