Technology
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I fail to understand why it needs to be grounded. I tried to search a bit but no one seems to have a physical account for their claims.
Basically, the energy needs to go somewhere. A feraday cage isn't meant to absorb EM energy, but to redirect it safely away from sensitive electronics. Otherwise, itcoulds still transfer that energy into your electronics.
For example, EMI shields inside your electronics, which are technically feraday cages, are grounded.
Video explaining the physics of feraday cages: https://yewtu.be/watch?v=eNxDgd3D_bU