Editor’s Note:  MSHA is focusing on spotlight on “a hazardous condition that may exist in 600 volt and 1000 volt circuit breakers.”  Of particular note, the “simplest way to determine if you have one of these circuit breakers installed or in your supply house is to run your finger nail down the square portion of the cover where the circuit breaker handle is installed. [illustration in attachment] If the cover is very smooth in this area, you probably have one of the hazardous circuit breakers.”   The complete MSHA document is attached below.