Originally Posted by meganjoe
If the power at the pedestal is reversed won't that affect all 120 volt ckts. in the camper??
Voltage on a black wire is positive when voltage on the white wire is negative. Then voltage on a black wire is negative when voltage on the white wire is positive. This happens 60 times every second. If wires are reversed, then what in those two sentences changes? Nothing. Polarity is irrelevant to how an appliance operates. Again, polarity is simply another protection layer for human safety.
Be wary of most who make recommendations (ie polarity causes appliance damage) when reasons why are never provided. Junk science would almost disappear if we held others to that standard. And also demand numbers. Most of us never demand that standard making scams so easy to promote.
"Other circuits" define many concepts including galvanic isolation. Even internal filters are designed so that polarity reversal is irrelevant.