EE & COWORKER WERE CHECKING CONTROL BOX IN THE CONTROL VAN FOR 100' CONVEYOR. POWER WAS ON AND WHEN EE WENT TO SHUT IT OFF, SOMETHING SHORTED BETWEEN MIDDLE FUSE AND ON/OFF HANDLE. EE RECEIVED BURNS ON BOTH WRISTS. ER DR. ORIGINALLY TREATED AND RELEASED HIM TO WORK. FOLLOWUP VISIT WITH ANOTHER DR. THE NEXT DAY ADVISED HIM TO TAKE TIME OFF TO AVOID DUST AND POSSIBLE INFECTION.