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Old 01-21-2019, 02:16 AM   #28
JoeDS
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Brand: Thor Motor Coach
Model: Vegas 24.1 - Sold it!
State: Tennessee
Posts: 282
THOR #6513
Remember the 30 to 15 amp adapter is only rated for 15 amps regardless of how it is made. The outlet it is plugged in to will likely have a 20 amp rated outlet fed by a 20 amp breaker.


If you overload it by an additional 5 amps the 20 amp breaker will allow this but the adapter is likely to get overheated and will could cause adverse consequences such as fire, sparks, and reduced voltage to the RV.


Personally I've never seen a 30 to 20 amp adapter for sale but its easy enough to make one by buying a 20 amp plug and 12 gauge wire. A safer alternative if you have the electrical skills to do so.


Technically the electrical codes only allow a continuous load of 80% of the circuits capacity which in this case would be 16 amps. Hence most adapters are only rated at 15 amps.


Hard to make a drawing here but the way you can tell the difference between the two types of plugs:


20 amp prongs look like this - | (one prong is perpendicular to the other)



15 amp prongs look like this | | (both prongs are parallel to the other)
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