Originally Posted by DKRITTER
I've had the external (38450) Surge Guard for years. Since the problem was in the cord where it connects to the trailer, it didn't help.
I've looked at switching to a hard wired system and think I will. If I had an internal Surge Guard it would have protected the trailer from all this.
While an external Surge Guard can detect power problems upstream of itself (the power pedestal), as you note it can't detect or protect your RV from a downstream malfunction. So, a problem in the shore power cord between the portable Surge Guard and your RV can result in a dangerous voltage condition, especially a hot-skin voltage. Shore power and extension cords lead a rough life, so regular cleaning and inspection of them is very important to keeping you and your RV safe from electrical problems.