gfci switches or relays and alarm generation circuitry connected to the load terminals on the opposite side application_number US 57281195 A description in order to afford a complete understanding of the invention and an appreciation of its advantages a description of a preferred embodiment in a typical operating environment is presented below shown in fig1 is a functional block diagram of the gfci incorporating miswiring prevention circuitry gfcimp the gfci 98 circuitry is depicted as a black box connected across the ac hot and neutral terminals with control signals going to both switch relays 88 90 the gfci circuit 98 can be any typical industry standard type gfci circuit that removes the power delivered to the load upon detection of a ground fault also included in many standard gfcis is a duplex receptacle 100 built into the device the duplex receptacle 100 is connected to the load hot and neutral terminals of the gfci 10 in order that power to it besides devices downstream be disconnected from the ac power upon the occurrence of a ground fault traditional gfcis consist mainly of these three elements gfci 98 switches 88 90 and the duplex receptacle 100 the gfcimp 10 employs additional circuitry to indicate the improper wiring of the device in an electrical system the additional elements are a sense circuit 94 alarm generation circuit 96 and power supply circuit 92 each will be explained in detail below the alarm generation circuit 96 will automatically generate an alarm if the following two conditions are met it is provided with.