EE walking on mixer floor heading north to check mixer reducer seals. Cleaning going on overhead so EE headed west to avoid affected area and walked b/t 2 electrical cabinets. Ducking EE bumped head on low conduit-chest height. EE brought to knees, didn't fall by striking conduit with head & felt neck crack. Treated w/PT 3/12/19 filed 7000-1 upon notification that PT started