However, if one of the 30 amp receptacles` is miswired with the neutral/hot reversed, which could happen at a remote location, when you plug in the dual adapter you get a dead short between the hot on one receptacle and the neutral in the other. Sparks will fly!
Not quite the same; and I'm sure it's been asked: My generator has the TT-30 (and two 'household' outlets). I'm upgrading to a newer trailer that has the 50A input (50-50); Other than buying a new generator, what's a solution? Should I get two dog-bones, one for each 50A leg, and swap as needed? (seems that I need an electrical diagram of the rig to know what gets powered off of each leg, so can prioritize...).
Actually, all 30-amp male to 50-amp female adapters should connect the single-pole output of your generator to both of the Line inputs on your 50-amp shore power cord. So everything in your RV should be powered up with a single adapter, albeit with only 30-amps of available current at 120 volts compared to the 100 (50+50) amps of current at 120 volts available from a 50-amp 120/240-volt split-phase outlet.
Just to extend this general discussion of phase combiners, a more common instance I'm seeing lately is poor man's L2 chargers for EV cars. Folks may have two, opposite phase 20A circuits in their garage but not a 240V welder/dryer/RV outlet at high wattage... so they wire two 5-20P males to a 240V 6-20R female, spanning the hots for 240/20A... enough to run a 16A EV charger at 3.8kw. Definite cheat, and might affect anything else using those circuits at 120V...
Much safer but pretty weird, my own charger permits 120V@24A input, so I sometimes use my home TT30 plug (in place of RV) with an adapter. Didn't listen when Mike advised to always install 50A/240V for RV as future proofing...wasnt thinking of EVs... lol.
GFCI protection on 20-amp outside outlets has been a code requirement for decades. These campgrounds could be liable if someone plugged in a frying pan to the 20-amp outlet and was electrocuted…
I think there is a typo in your article.
(L1+L1 or L1+L2) should read(L1+L1 or L2+L2).
Oops, you are correct! Thanks…
If both 30 amp are on the outlet side of a 30 amp breaker wouldn’t the breaker keep tripping?
However, if one of the 30 amp receptacles` is miswired with the neutral/hot reversed, which could happen at a remote location, when you plug in the dual adapter you get a dead short between the hot on one receptacle and the neutral in the other. Sparks will fly!
Oh yes, most definitely! ⚡️⚡️⚡️
30A Generator to 50A RV?
Not quite the same; and I'm sure it's been asked: My generator has the TT-30 (and two 'household' outlets). I'm upgrading to a newer trailer that has the 50A input (50-50); Other than buying a new generator, what's a solution? Should I get two dog-bones, one for each 50A leg, and swap as needed? (seems that I need an electrical diagram of the rig to know what gets powered off of each leg, so can prioritize...).
Actually, all 30-amp male to 50-amp female adapters should connect the single-pole output of your generator to both of the Line inputs on your 50-amp shore power cord. So everything in your RV should be powered up with a single adapter, albeit with only 30-amps of available current at 120 volts compared to the 100 (50+50) amps of current at 120 volts available from a 50-amp 120/240-volt split-phase outlet.
I’ve already posted about this here: https://rvelectricity.substack.com/p/how-does-a-30-amp-to-50-amp-adapter
thank you, thank you, thank you. Pretty sure you had... but I wasn't in the market for the larger trailer in May ;-)
Just to extend this general discussion of phase combiners, a more common instance I'm seeing lately is poor man's L2 chargers for EV cars. Folks may have two, opposite phase 20A circuits in their garage but not a 240V welder/dryer/RV outlet at high wattage... so they wire two 5-20P males to a 240V 6-20R female, spanning the hots for 240/20A... enough to run a 16A EV charger at 3.8kw. Definite cheat, and might affect anything else using those circuits at 120V...
Much safer but pretty weird, my own charger permits 120V@24A input, so I sometimes use my home TT30 plug (in place of RV) with an adapter. Didn't listen when Mike advised to always install 50A/240V for RV as future proofing...wasnt thinking of EVs... lol.
There are still a lot of older campgrounds that still don't have a 15 amp GFCI plug and I regularly use the "45 amp" Y cord.
GFCI protection on 20-amp outside outlets has been a code requirement for decades. These campgrounds could be liable if someone plugged in a frying pan to the 20-amp outlet and was electrocuted…