AN EMBRAER 120 AT FAF HAS THE PWR LEVERS ADVANCED INADVERTENTLY INSTEAD OF THE CONDITION CTL CAUSING AN ENG AND PROP OVERSPD CONDITION.

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ON THE 4TH DAY OF AN OTHERWISE UNEVENTFUL TRIP; WE WERE FLYING THE ILS RWY 22 APCH TO EVV. AT NIGHT; IN IMC; WE HAD 80 DEGS OF XWIND; TURB AND THE RWY WAS RPTEDLY COVERED WITH SNOW. THE CONDITIONS WERE NOT EXTRAORDINARY; BUT THEY KEPT ME SOMEWHAT PREOCCUPIED. SHORTLY BEFORE REACHING THE FAF; THE CAPT CALLED FOR 'PROPS 100%' BUT ACCIDENTALLY I MOVED THE PWR LEVERS INSTEAD OF THE CONDITION LEVERS. INITIALLY THE PROPELLER SPEED GAUGES DID NOT MOVE; BUT THE 'ENG NOISE' INCREASED AS USUAL. I GLANCED OVER TO MY SIDE TO CHK OUR POS IN REF TO THE FAF. THAT IS WHEN I NOTICED AN INCREASE IN AIRSPD; LOUDER THAN USUAL ENG SOUNDS AND STILL NOT ADEQUATE PROPELLER SPEED. I IMMEDIATELY PULLED THE PWR LEVERS BACK AND CALLED OUT MY MISTAKE; WHICH WAS ACKNOWLEDGED BY THE CAPT RIGHT AWAY. 10-12 SECONDS AFTER THE 'PROPS 100%' COMMAND WAS ISSUED; ALL ENG CTLS WERE BACK TO NORMAL AND WE LANDED WITHOUT FURTHER COMPLICATIONS. IN THE MEANTIME; HOWEVER; ENG LIMITATIONS WERE EXCEEDED AND THE MARGIN OF SAFETY WAS REDUCED.