A GROUND FAULT PROTECTION CIRCUIT FOR MULTIPLE LOADS WITH SEPARATE GFCI BRANCHES AND A COMMON NEUTRAL FOR THE GFCI ELECTRONICS

摘要

A ground fault protection circuit for plural loads connected across a power source with plural branches which can be used where the loads are unbalanc ed. Each branch includes a ground fault circuit interrupter device that has a common line for the electronics of the GFCI separate from the neutral line from the power so urce to the load where the common lines for the electronics for the ground circuit inter rupter devices in each branch are connected to a common point. The ground fault protect ion circuit employs plural ground fault circuit interrupter devices and eliminates n uisance tripping. The common line for the electronics for a GFCI is routed through the c ore of the current sensing transformer of the GFCI. The separate neutral line for the electronics, connecting the common lines for the electronics for plural GFCI dev ices and routing the common lines for the GFCI electronics through the core of the transformer of each GFCI, eliminate improper GFCI operation due to unbalanced loading. The ground fault protection circuit may be used for a three phase power source.