Why electronic equipment should be grounded

The introduction of grounding technology is initially to prevent electric or electronic equipment such as lightning and take protective measures, the purpose is to produce lightning strike current through the lightning rod into the earth, thus playing a role in protecting the building. At the same time, grounding is also an effective means of protecting personal safety, when some cause of the phase line (such as poor insulation of wires, line aging, etc.) and equipment shell touch, the shell of the equipment will have a dangerous voltage, which generates a fault current will flow through the PE wire to the earth, thus playing a protective role. With the development of electronic communications and other digital fields, in the grounding system only consider lightning protection and safety has been far from meeting the requirements. For example, in the communication system, a large number of interconnections between the signal equipment requires each device to have a reference 'ground' as the signal reference ground. And with the complexity of electronic equipment, signal frequency is getting higher and higher, therefore, in the grounding design, signal interferences between the electromagnetic compatibility issues must be given special attention, otherwise, improper grounding will seriously affect the reliability and stability of system operation. Recently, high-speed signal reflow technology has also introduced the concept of "ground".