Cutting off Electricity Automatically of Leading Cover Opening with Lagging Lockout for Flameproof Electrical Apparatus

Compared the theory and applicability of grading lockout and swith lock with two precautions technology in preventing opening cover,digital inputs transmission,a method of ante-disconnection caused by opening cover and lagging lockout for flameproof electrical apparatus was suggested.The method is superiority in simple and safe.The goal is preventing opening cover when powering and thus causing gas explosion by electrical spark.