Patent ID: 7514932

Claim:
An electrical system for monitoring a plurality of power lines that deliver current and voltage from a three-phase power supply to an electrical load, wherein the plurality of power lines includes a power-line-A, a power-line-B, and a power-line-C, the electrical system comprising: a plurality of signal wires connectable to the plurality of power lines and conveying a first set of signals and a second set of signals; and a monitoring mechanism having a plurality of inputs connected to the plurality of signal wires, at least one input of the plurality of inputs can be selectively wired to the plurality of signal wires in a proper manner and an inverted manner, wherein the monitoring mechanism compares a zero-crossing slope value of at least one of the first set of signals to a polarity of at least one of the second set of signals and upon doing so executes logic that determines whether the at least one input is wired in the inverted manner as opposed to the proper manner.