Tandem electric circuit breaker

Claim 1

AN ELECTRICAL PANELBOARD COMPRISING: (A) A MOUNTING PANEL ASSEMBLY, AND (B) A PAIR OF SUBSTANTIALLY IDENTICAL MOLDED-CASE ELECTRIC CIRCUIT BREAKERS MOUNTED THEREON IN ABUTTING END-TO-END RELATIONSHIP AND REVERSELY POSITIONED WITH RESPECT TO EACH OTHER SO THAT A PARTICULAR END WALL OF THE CASE OF ONE CIRCUIT BREAKER ABUTS A CORRESPONDING END WALL OF THE CASE OF THE OTHER CIRCUIT BREAKER, (C) EACH CIRCUIT BREAKER HAVING A FIRST CIRCUIT BREAKER MECHANISM AND A SECOND CIRCUIT BREAKER MECHANISM DISPOSED IN THE CASE THEREOF IN TANDEM RELATIONSHIP FROM ITS SAID END WALL, (D) EACH CIRCUIT BREAKER MECHANISM INCLUDING A PAIR OF SEPARABLE CONTACTS BETWEEN WHICH AN ARC TENDS TO FORM UPON SEPARATION THEREOF WHEN ENERGIZED, AND (E) EACH CIRCUIT BREAKER HAVING A FIRST ARC CHUTE AND A SECOND ARC CHUTE RESPECTIVELY ASSOCIATED WITH THE SEPARABLE CONTACTS OF THE FIRST AND SECOND CIRCUIT BREAKER MECHANISMS THEREIN, SAID FIRST ARC CHUTES VENTING RESPECTIVELY THROUGH SAID END WALLS WHEREBY ARC BY-PRODUCTS CAN BE DISCHARGED FROM SAID FIRST ARC CHUTE OF ONE CIRCUIT BREAKER INTO THE FIRST ARC CHUTE OF THE OTHER THROUGH SAID ABUTTING END WALLS, AND SAID SEOND ARC CHUTES VENTING RESPECTIVELY THROUGH WALLS OF SAID CASINGS FACING SAID MOUNTING PANEL ASSEMBLY.