Lockout start switch

Some power tools have a lockout for the start switch. The idea is to prevent inadvertent operation. A tool cannot operate until a keyed switch selects the operating mode. 

The accidental or unexpected sudden starting of electrical equipment can cause severe injuiy or death. Before ANY inspections or repairs are made (even on the so-called low-voltage circuits) the current should be turned off at the switch box and the switch padlocked in the OFF position. At tlie same time, the switch or controls of the macliine or other equipment being locked out of service should be securely tagged to show which equipment or circuits are being worked on. Lockouts and tagouts should be removed only by the individual(s) who installed them. 

Labels for all start-stop switches 8. Equipment designed to permit lockout ... 

Equipment must be isolated from all electrical energy sources by opening and locking all main power supplies. If the main power supply cannot be locked out, a qualified electrician must physically disconnect the equipment from the power source. Lockouts of electrical equipment are to be made at the main power supply—the use of local switches may leave other portions of the equipment energized. Once the electrical lockout is complete, an attempt should be made to start the equipment locaUy to ensure it is properly isolated before the maintenance work starts (and then all switches should be returned to their off position and tagged Do Not Operate ). 

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