Comment by dspillett

It varies, but in many places you couldn't sell a device without proper shielding, but unless you are causing disruption to a public service or safety equipment there is nothing that stops a person owning and running one. Just think of the world full of rPi units, other SBCs, and other PCs, running completely caseless or in cases without much/any thought towards EMC shielding - it obviously isn't a problem, or it would be a big problem.

Most rPi units and similar are fine as they can be argued to be sold as parts rather than devices just like any other motherboard¹. The Pi400 presumably gets away with it, as something this is conspicuously sold as a device not a part, because that chonky heatsink² is enough to disrupt any errant EM fields outside the ranges that it should be emitting (those around 2.4GHz and 5GHz).

There are many grey areas, and indeed those where the letter of the regs is broken but not enforced. To cut a long story short wrt “Is this "legal" to run a pc open like that?”: yes running a PC in a case like that with no extra shielding is legal pretty much everywhere, though selling a complete PC with a case like that probably breaks regs and maybe even laws.

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[1] putting the responsibility with the purchaser, where it isn't enforced unless it is a problem (I chose not to shield my TV-box Pi4, not the company, and it isn't putting enough junk out to disrupt anyone else's anything else)

[2] everything else about the case is plastic