Here’s a bubba-fied way to make a faraday cage.
http://www.thesurvivalistblog.net/building-a-faraday-cage/
For later.
You’re mix-matching your electromagnetic radiation.
A Carrington event/solar flare/charged particles are indeed easily protected using a farday cage, electonric circuit breakers etc.
An EMP event is a nuclear bomb detonation which releases a gamma ray burst that has several follow on effects that effectively fry unshielded electronics. It requires several inches of steel or feet of earth to insulate against a weapons-grade gamma ray burst.
A typical protection strategy for an EMP strike is to bury additional essential electronic equipment several feet underground since putting 4” of steel around all electronics is sort of impractical.
I’ve been told that old microwaves make excellent faraday cages for smaller objects.