[Solved] Earthing in plastic enclosure

andreas smith Asks: Earthing in plastic enclosure
I’m working on a device with a plastic enclosure. It has a typical AC receptacle, a touchscreen, and some rubber/plastic buttons, everything else the user may touch is non-conductive plastic case. My question is, how should I earth this? In devices with metallic cases I’ve seen people earth the chassis, but that doesn’t make any sense to me here. The screen “casing” is also plastic. Inside the device is mainly a motor/pump assembly at 24V and some measurement electronics and MCU operating at 5V off of non-isolated switching regulators that step-down from the 24V line. The 24V line is generated through a medically rated power supply according to IEC 60601.

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