Mmmm... I suppose that some of this methods may be effective. Basically you must create a Faraday box (not sure if this is the correct English term) and be sure that all the potential is discharged on ground... I know that a conventional Faraday box can be created with a web of conductors instead of solid metallic walls. But with an EMP... who knows?!
And this make me think that the use of a high altitude nuclear explosion to produce an EMP must be in the plans of the US and Russia since the its discovering... Ok, I suppose it was evident
, but until I always have viewed the EMP's as a side effect. Nor as a tactic.