A faraday cage would probably work, but for such low frequencies I'm not sure what the construction would require. What's the point of building a device in a faraday cage if you can never use it?
I had opened several PC SMPS and actually never saw anything like a faraday cage, except the actual metal box it is housed in.
The manufacturers appear to mainly focus on EMI suppression components and don't seem too worried about more shielding and these power supplies are legal in my country. This measure indicates that they want to prevent RF injection into the power grid.
It can however not harm to build a box around the device that acts like a faraday cage.
If i'll drive it from a battery on top of it, it's even better or with proper ferrite chokes.
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