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Old 11-01-2011, 01:35 PM   #1
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Is this safe or not?

50 amp RV plugged into a 50-30amp dogbone, plugged into a 30-15amp dogbone, plugged into a 15amp circuit at home.

Only looking to keep batteries charged.

Thanks!
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Old 11-01-2011, 01:40 PM   #2
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Plenty safe. I do it all the time. Obviously be careful what else you turn on but you should be fine.

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Old 11-01-2011, 02:05 PM   #3
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Quote:
Originally Posted by USMCRET View Post
50 amp RV plugged into a 50-30amp dogbone, plugged into a 30-15amp dogbone, plugged into a 15amp circuit at home.

Only looking to keep batteries charged.

Thanks!
Been doing it for many years, only once did I have a problem and that was due to corrosion on the adapter.
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Old 11-01-2011, 03:22 PM   #4
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Do it all the time to keep batterys hot. Be careful how long your cord is--50 ft or less #14 OK--Over that use a #12. I know a #14 is good for 15 amps ,but if you get too long voltage drop becomes a factor.Also make sure your connection is tight and clean. As already stated this is often where a problem pops up. DO NOT try to run AC .
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Old 11-01-2011, 03:41 PM   #5
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First of all I use the same arrangement occasionally when only 15A is available.

Having said that, I have also wondered if I'm defeating the purpose of the circuit breaker/fuse. The fuse/circuit breaker is supposed to be the weakest link in the circuit and would trip before any damage was done to a cord or appliance. This setup makes the 12 or 14ga wire the weakest link.

I'll bet the code enforcers would have something to say about it.
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Old 11-01-2011, 04:12 PM   #6
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It is perfectly fine in doing what you are doing, the receptacle that you are plugged into should be protected by a 15 or 20 amp breaker, so even if you did turn on too much stuff the breaker will trip protecting the cord you are using. (providing you are using a #14 or #12 gauge cord) Do not use a #16 gauge or smaller cord. (By the way, I'm an electrician licensed in 4 states) The weak point is loose connections at the adapters, so if the adapter or the receptacle is loose, replace it.
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Old 11-01-2011, 05:13 PM   #7
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Thanks for the feedback. Much appreciated!
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Old 11-01-2011, 06:11 PM   #8
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After thinking about this a little and reading Hillbilly2's response, I totally agree with him.

For some reason my brain was thinking the motorhome was the source, not the other way around. Sorry if I confused anyone else.
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Old 11-01-2011, 07:27 PM   #9
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Do it all the time to keep battery hot
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Old 11-01-2011, 07:58 PM   #10
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The lowest rated circuit breaker is the one in control. You won't ever trip the 30A main power breaker in the RV panel this way, but you sure could the 15A breaker that supplies the circuit that you are plugged into.

The only concern is that you do need to make sure that you do not draw enough current to cause the extension cord or the 15A outlet get hot. That can and on occasion does happen. I have seen an outlet of adapter actually melt.
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Old 11-01-2011, 08:02 PM   #11
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I do this as well. With the new rig, I had problems with melting the 30 to 15 amp adapters. After the second one melted down, taking a rally good 20 amp extention cord with it, I put a 30 amp receptacle on the 20 amp circuit in the garage. This has been working great.

I tihnk it's the 100 amp charger, it draws a lot of power.
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Old 11-01-2011, 09:40 PM   #12
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Jim brings up a really good point about the amount of current the charger can draw. Designs vary but mine is adjustable on the one place control panel and when plugged in to 15 amps I always make sure it is set to not exceed 5 or 10 amps... depending on whether or not we are living in the rig at the time. This, as compared with the factory default of 25 amps draw... which would raise havoc with the 15 amp connection.

We spend about a month per year at my FIL's place in Minnesota where we've only had access to a 15 amp circuit... with about a 100 foot cable run so we've gotten pretty good at conserving even though we're not dry campers.

Good luck.

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Old 11-01-2011, 09:47 PM   #13
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Quote:
Originally Posted by USMCRET View Post
50 amp RV plugged into a 50-30amp dogbone, plugged into a 30-15amp dogbone, plugged into a 15amp circuit at home.

Only looking to keep batteries charged.
If this is all you are doing, your fine and dandy!

RV'ers are compelled quite often to do this under rally conditions where only 20A is available. A very difficult obstacle to overcome but if all your friends are there these types of inconveniences are sometimes tolerable.
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Old 11-04-2011, 08:15 PM   #14
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One thing on your extension cord that has been mentioned is make sure it is big enough. I would recommend nothing under 12 ga. Also DO NOT coil up your extra cord on an extension cord. This will act like a resistence coil and could heat up and start throwing the 15 amp breaker or worse case cause a fire. Try to have as straight a run on your extension cord as possible and don't let the cord overlap it's self.
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