WHILE IN PROCESS OF REPLACING IMPELLER ON A CONDITIONER THE EE REACHED DOWN TO RAISE IMPELLER OUT OF FEED TO INSTALL A CABLE SLING. EDGE OF IMPELLER CUT THROUGH HIS GLOVE & INTO THE FINGER. EE WAS WEARING WORK GLOVES & ALL REQUIRED PPE. LACK OF SKILL-INADEQUATE PRACTICE. VERY FEW STAINLESS STEEL IMPELLERS ARE USED IN THIS SERVICE. EE DID NOT RECOGNIZE POSSIBILITY OF EDGE BEING AS S