Grounding is not a minus of power supply. Grounding is a wire connected to an electrode that is buried in the ground
Earth - grounding is an object with an infinite number of free electrons.
The housing and connectors of standard products must be identical and interchangeable.
The minus power supply of the processor and the galvanically isolated circuits CANNOT be grounded, properly speaking zeroed or connected to the minus power supply.
The products must pass mechanical strength tests - vibration tests.
The device that was designed for 12V power supply should be powered by 12V, not 220V.
Climatic compatibility of radio electronics is the ability of the device to work at different temperatures and alazhnosti.
Rogue engineer, research engineer, test engineer, design engineer, Chief EMC specialist.
Certificate TR TS 020 "Electromagnetic compatibility of technical means". Certificate TR TC 004 "Low-voltage equipment". Certification in PJSC Rosseti.
EMC is the fourth dimension in the construction of radio electronics. EMC tests simulate 10 years of operation of the device in real conditions.
Grounding - "GROUND" is intended for the electrical safety of people, it is also an element of protecting the device from interference and radiation.
GOST IEC/TS 61000-1-2-2015 Electromagnetic compatibility (EMC).