This is used for generators that have an 'open neutral or floating neutral.' Generators with a floating neutral might cause the Power Watchdog EPO surge protectors to ive an 'open ground' or 'open neutral' error code. This will prevent power going into your RV. To prevent this issue, just plug this item into an unused 15Amp AC receptacle on the generator. This will create a neutral to ground bond and the problem should be solved.