What is difference between electrical and instrument earth?

Question

Accepted Answer

Electrical earth is used for safety of electrical equipment while instrument earth is used for safety of instruments.

Electrical earth is used to protect electrical equipment from electrical faults and surges.
Instrument earth is used to protect sensitive instruments from electrical noise and interference.
Electrical earth is connected to the earth electrode while instrument earth is connected to the instrument chassis.
Electrical earth is a safety measure while instrument earth is a functional requirement.
Examples of electrical earth include grounding of electrical panels, transformers, and generators while examples of instrument earth include grounding of control systems, sensors, and transmitters.

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