EE WAS REMOVING A NUT FROM A SPARE 4160 VAC SWITCH GEAR TO REPAIR THE GANTRY CRANE 4160 VAC SWITCH GEAR HE WAS REPAIRING. WHILE REMOVING THE NUTTHE CABINET FLASHED CAUSING 1ST DEGREE BURNS TO HIS FACE AND 1ST,2ND,& 3RD DEGREE BURNS TO HIS LT. FOREARM. THE EE WAS WEARING HIS HARD HAT ANDSAFETY GLASSES, WHICH PREVENTED FURTHER INJURY. EE DID NOT MAKE CONTACT WITH THE 4160 VAC.