Less expensive alternative to a EMS devices that I use.
No doubt they are
very worthwhile devices, but very expensive. Do you have one on your house? No probably not. It would cost several thousand dollars and turn off the electricity when a fault occurs which most people would not find desirable.
Now what is the difference between your house service and your RV service? Well the main difference is one is permanently wired and the other plugs in and was used my a 1000 other people before you got there. Ah, there is the rub. That nasty dirty, seldom maintained PLUG!!
So allow me to give you my approach and thoughts. I've been RVing for 48 years and have had over 18 different RVs ( which of course make me an expert
). During that time I have never had a fault that damaged my RV. But that is not to say I have not encountered any problems because I have. My approach is to use a testing device to tell me about the service I'm connecting to and then I decide if I want to use it or or not.
I have one of these to test a service to see if there is a problem.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Best $13 you will ever spend. I leave it plugged in permanently and check occasionally to be sure the voltage is OK.
You might say this is fine for a 30 amp service but what about a 50 Amp service? Well yes you would have to have 2 of them one on each leg of the 220 v service. But frankly electrically that is for the most part unnecessary since only looking at one leg tells you 90 % of what you need to know. Ground - neutral - reverse polarity - voltage.
Now a word of advice. ANYBODY can use one of above devices safely.
The Following surge protector (or EMS ) device assumes you are a knowledgeable individual and know how to safely open a panel and install this device. If not consult an electrician.
Now what about voltage spikes. Here is a simple device which you can install in your distribution panel. (This is something you should have in your house too and is affordable). They range from $35 and up. Lowe's, Home depot, or local electrical supply house will have many different types. It is a little box or breaker that monitors each leg of the line and when a voltage spike comes it triggers and absorbs the high voltage. (the following is just an example - not an endorsement - there are many types)
That's my 2 cents worth