CABIN ATTENDANT NOTED CABIN TO COCKPIT CALL SYSTEM INOPERATIVE DURING PREFLT CHECK AND ADVISED THE PIC. FLT CREW RESET TKOF WARNING CIRCUIT BREAKER CORRECTING THE PROBLEM. PIC THINKS THIS CABIN CALL POWER SOURCE SHOULD BE SEPARATE FROM TKOF WARNING POWER SOURCE.

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ARRIVED AT ACFT TO OPERATE EWR TO BOS. AFTER BRIEFING THE CABIN ATTENDANTS; THE FIRST F/A INFORMED ME THAT THE CABIN TO COCKPIT CALL SYS WAS INOP. FURTHER INVESTIGATION REVEALED THAT A CB WAS PULLED AND RESETTING IT SOLVED THE PROB. IT WAS INTERESTING TO NOTE THAT THE CB THAT PWRS THIS REQUIRED SYS IS THE SAME CB THAT PWR THE TKOF WARNING SYS IN THE MLG (CB P-38-CAWS). I THINK THAT THE PWR FOR THIS CHIME SYS SHOULD BE DRAWN FROM ANOTHER SOURCE. SHOULD THE CENTER AURAL WARNING CB BE OPEN FOR SOME REASON; AND AN IMPROPER FLAP/SLAT COMBINATION BE SELECTED FOR TKOF; A CABIN CREW MEMBER COULD NOT SIGNAL THE COCKPIT SHOULD A PAX OR CREW MEMBER NOTICE THE DISCREPANCY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: THE ADJACENT CALL SYS CB IS FOR THE PAX CABIN CALL LIGHTS. THE CB IN QUESTION IS A CHKLIST ITEM FOR THIS AIRLINE AND A COPY OF THIS RPT HAS BEEN GIVEN TO THE AIRLINE MGMNT. RPTR INDICATED THAT HIS COMPANY DOES NOT THINK THE SAFETY IMPROVEMENT SUGGESTION IS VERY IMPORTANT AND NO ACTION IS BEING TAKEN.