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Old 06-28-2020, 09:29 PM   #1
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Hot Bone

I've got a 50-amp plug coming out of the RV and a 30-amp receptacle at the shop, necessitating a bone. I have noted that the connection between RV plug and bone becomes quite hot after half a day of running one AC. Voltage inside the RV will start out at 120V with nothing running but will drop to 116V when the compressor initially kicks in. After about 4 hours, it's down to 112V and the bone connection is quite hot -not melting hot but well on it's way.


New bone in order, or just clean the male terminals?


Thanks!
Petrolero
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Old 06-28-2020, 09:36 PM   #2
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New dog bone , clean terminal and a clamp on amp meter .

IF your only got the one A/C running 30 amp supply should be ok without heating up.
Fridge on propane , water heater ?
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Old 06-28-2020, 10:28 PM   #3
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Been there, done that. Here's what happens to a plug when you're at the end of the line of 10 coaches on a generator run at an RV rally, fridge & water heater on propane & attempting to run just 1 AC because it's 95 degrees outside & got put in a spot with no shade.

Lori-
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Old 06-28-2020, 10:53 PM   #4
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The heat source can be anything, broken wires, loose screws, terminal corrosion, arcing tits on contacts preventing proper contact; laser thermometer or sometimes fingers can help determine source of the heat, which also causes the voltage drop. Luck
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Old 06-29-2020, 07:22 AM   #5
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Quote:
Originally Posted by Skip426 View Post
New dog bone , clean terminal and a clamp on amp meter .

IF your only got the one A/C running 30 amp supply should be ok without heating up.
Fridge on propane , water heater ?

Water heater is off, fridge on AC-


But the Air Conditioning is of course the big draw on amps and resultant voltage loss. I'm thinking I shouldn't be stressing the 30AMP circuit too much, so the heat-up of the dog bone is surprising.
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Old 06-29-2020, 07:23 AM   #6
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Originally Posted by NLOVNIT View Post
Been there, done that. Here's what happens to a plug when you're at the end of the line of 10 coaches on a generator run at an RV rally, fridge & water heater on propane & attempting to run just 1 AC because it's 95 degrees outside & got put in a spot with no shade.

Lori-

Thanks for the pic-



This is where I fear I'll be if I don't get this sorted.
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Old 06-29-2020, 07:28 AM   #7
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Don't have 50 amp available in shop ?
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Old 06-29-2020, 07:57 AM   #8
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And make sure you aren't hot plugging. Connecting to power while things are turned on can create arcing and burnt spots on the contacts. Either turn off the outlet breaker or the coach main breakers before plugging in.

Also keep in mind the distance the shop outlet is from the main breaker box. If it is a long distance and uses the minimum required wire gauge adding your rv cord into the mix can cause some voltage drop and heat on it's own.
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Old 06-29-2020, 08:32 AM   #9
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Do you have a 20amp plug close to the 30amp? If so you could get one of these. I use mine a campgrounds all the time with no issues, but you need to have a 30amp and 20amp circuit available to get the full 50 amps, if you plug in just the 30amp side it will only energize one leg of the 50amp service.

https://www.amazon.in/FidgetGear-MIC.../dp/B07NJQ83G7
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Old 06-29-2020, 09:48 AM   #10
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I have never seen a dog bone adapter run cool with near max load and any length to the run, burnt up more than my share of them

Usually low voltage and high amps and a new dog bone after a few days or hours all go together

If your on a 30 amp 240 (with home made adapter) then install another outlet for 50 amp if possible to upgrade the wire size

If this is originally wired for 30 amp RV then you sure might be light on wire size to the outlet as well

I use the same 50 4 wire receptacle for the welders, coach, car and so on
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Old 06-30-2020, 08:10 AM   #11
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Don't have 50 amp available in shop ?

There's an RV 30Amp outlet on the north side, probably run using 12-2 Romex.
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Old 06-30-2020, 08:14 AM   #12
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And make sure you aren't hot plugging. Connecting to power while things are turned on can create arcing and burnt spots on the contacts. Either turn off the outlet breaker or the coach main breakers before plugging in.

Also keep in mind the distance the shop outlet is from the main breaker box. If it is a long distance and uses the minimum required wire gauge adding your rv cord into the mix can cause some voltage drop and heat on it's own.

Hot plugging is not good practice and I avoid it. The RV outlet is on the opposite wall from the breaker box, so that's a part of the issue.
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Old 06-30-2020, 08:25 AM   #13
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If your running thru 12 gauge, that may be a big part of the hot plugs.

30 amps at minimum 10 gauge wiring.

One thing I found is the adaptors that look like dog bones, with wire between the plugs, run cooler then the short ones like someone posted.
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Old 06-30-2020, 08:35 AM   #14
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I keep an electric product called No-Ox on the plug for my RV.

Helps keep the terminal clean.

Ken
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