EMPLOYEE WAS PLUGGING A JIG SAW INTO AN EXTENSION CORD TO CUT A PIECE OF PLYWOOD. THERE WAS A BARE SPOT IN THE EXTENSION CORD ALLOWING THE EMPLOYEE TO COME INTO CONTACT WITH 110 VOLT ELECTRICA L CURRENT IN THE CORD. EMPLOYEE APPEARED TO RECEIVE A MINOR SHOCK. EMPLOYEE COMPLAINED OF A TINGLING SENSATION IN ARM.