Five-prevention usually refers to the abbreviation of five kinds of error-prevention functions for high-voltage electrical equipment in order to ensure personal safety, and is one of the important measures for power safety.

These five preventive measures are: to prevent the circuit breaker from opening and closing by mistake; Isolating switch for preventing on-load opening and closing; Prevent the grounding wire (grounding switch) from hanging (closing) with electricity; Prevent the circuit breaker (grounding switch) with grounding wire from closing; Prevent from entering the charging interval by mistake.