I installed a Progressive HW 50 Surge Protector about two weeks ago. This was our first time out since installing it. A Class A motorhome pulled in beside us and was having trouble with their electrical service so they called the park owner. When the owner opened the box to check the wires, he touched something and sparks flew everywhere. My surge protector shut down my power but my neighbor who does not have a surge protector lost his converter, his big screen TV, his A/C, his microwave and a radio. My power came back on after about 2 or 3 minutes and everything is OK. Thank you Progressive!!! Ofcourse, the park owner says he can't believe the problem is his responsibility. Go Figure. Ken