Hi Time2roll,
Actually a few of us do apply the rule. I do use deoxit on connections before I plug in (for the first time in a particular location).
You are correct that the rule is not a requirement for plug in devices, which means RV's can legally ignore it.
time2roll wrote:
No one actually applies this rule as it is not required for an RV because all items are short term or thermostatically controlled so by definition an RV is not a continuous load. However as you have experienced it is easy to have the air conditioners run continuous for 10+ hours and the EMS will hold the RV very close to 30 amps for well over the 3 hour requirement. Then you have the booster that will draw more amps to get the voltage corrected.
IMO this can put you in the continuous service definition. Ever wonder why so many 30 amp connectors and adapters are burn, worn, and heat damaged? OK not just this but I believe it contributes significantly.