THE CONTROL ROOM OPERATOR CALLED EE CONCERNING A PROBLEM WITH THE TERTIARY CRUSHER MAIN BREAKER. EE STARTED THE TROUBLESHOOTING BY CHECKING VOLTAGE ON THE TERTIARY MAIN BREAKER WITH AN ANALOG VOLTMETER; AN EXPLOSIVE SHORT CIRCUIT CAUSED EEBURNS ON BOTH HANDS AND FACE. CAUSE OF ACCIDENTCOULD HAVE BEEN THE WRONG SETTING ON THE ANALOG VOLTMETER WHEN TAKING THE READING.