Originally Posted by fectrain
I guess I'm guilty as charged, I'm plugging into a 20 amp circuit with an adapter. So I guess the next thing you are going to tell me is I damaged the cord end by doing this?
Not necessarily, but when you do plug into the 20 amp outlet (which is something else I was going to touch on for a different reason though), are you connecting/disconnecting the cord at the RV while plugged into the 20 amp outlet?
This is another problem in itself, since most people who attach cords to their houses, do not actually run inside their house and flip the circuit breaker off when connecting/disconnecting....or go inside the RV and flip the main breaker off (which would also solve the problem somewhat).
Since the converter, microwave clock, television standby all require some 120 volt AC power...... when you connect to shore power you will get an instant power draw because of these items..... which is also what causes the arcing if the connections are not tight....and you also get a little arcing just from connecting either at the RV, or at the camp/house outlet depending on which one you do last at the final connection.
It's a little different than just connecting an extension cord at your house to say use a light, drill, electric weedeater. Since these items have on/off switches, there is no instantaneous power draw when connecting these to an extension cord, and thus no arcing. Your RV is different as mentioned above, and you do have items that will instantly draw power when connecting...or are still drawing power when disconnecting power cords if the circuit breakers are still on.
This is why you want to make all firm connections without power.....then turn the power on with a circuit breaker...either your house or the RV's...or both if you want to get really safe. You also do the same before disconnecting.
You can think of it like a water hose, and what happens when you try to hook or unhook a hose with water pressure still applied.
BTW, welcome to the forums which I also should have acknowledged in my initial post.