Originally Posted by lswartz
This is a new one for me. At almost all camp sites with electric it is always on when we plug in. What problem does this cause?
Similar to having your home vacuum cleaner on/off switch in the on position before plugging it in. You might get an arc - doesn't happen often, but it can. The current flow is looking for a ground and if the switch is on when you plug in, the ground is made.
Applies to any electrical device - turn the device's switch off before plugging it in.