4 EMPLOYEES WERE MOVING AN ELECTRICAL PANEL INTO POSITION IN A NEW ELECTRICAL CONTROL ROOM. DUE TO MISCOMMUNICATION ONE EMPLOYEE PUSHED WHEN HE THOUGHT EVERYONE ELSE WAS PUSHING. UNFORTUNATELY THIS EE WAS THE ONLY PERSON PUSHING. HE FELT A PAIN IN BACK. THE NEXT DAY AT HOME EE DID'T FEEL MUCH PAIN UNTIL HE SNEEZED. TAKEN TO HOSP. & DIAGNOSED W/FRACTURED RIB. DELAY IN DIAG=LATE REPO