MEXICOWANDERER wrote:
Not advocating or detracting. Mere info...
A large grid which an RV park is...
Has innumerable loads shared by X1 X2 X3 X0 single tranformer connection. Most homes utize dedicated transformer service drops. Don't care if the transformer is 20Kw or 200Kw once the power exits the transformer it's a commonly shared circuit. Like children in class in flu season.
Lightning pathways are unpredictable. If a strike is close enough it will eat the best EMS for lunch. Unplugging is the sole protection.
I spent my entire career in the electrical industry and I agree. While an EMS is a great item and saves lots of damage, nothing will withstand a direct or very close to direct lightning strike.
But "I will not plug in anywhere without my PT50C".