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You could use an old microwave oven as a faraday cage with no modifications if it keeps microwaves in it will keep microwaves out.
False.

How can I prove it? Simple. Look inside a microwave when it's running. See anything inside? Sure you do... there's little holes in the door. Heck, there's even a light bulb inside the thing to make it easier.

Those holes stop microwaves but allow light to pass through. Microwaves are a lower frequency than light, so the holes will only block low frequencies. Those same holes will allow higher freqeuncies to pass through, and it's those higher frequencies that will damage electronics.
 

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TBF, @Mr.penguin did only claim it would stop microwaves.
That would technically qualify as a faraday cage.
Then it's a matter of whether it blocks the intended frequencies, which haven't been specified from what I can tell.
All fine and dandy. But if there's a large enough burst of microwave energy strong enough to fry your electronics, are you gonna survive the event?
 

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OP hasn't mentioned what he's trying to protect against.
Well, considering it's about faraday cages, it's safe to say........ maybe......... possibly............. an EMP?
 

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... since the infrastructures that support these devices will also be destroyed so they won't work anyway. ...
Not necessarily. EMPs and CMEs don't always destroy everything that's unprotected.
 
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