Patent ID: 7161345

Claim:
A power monitoring system comprising: (a) a first current sensor suitable to sense first changing electrical current within a first conductor to a first load; (b) a second conductor sensing a first voltage potential provided to said first load; (c) a power monitor superimposes a first signal on one of said first conductor and said first current sensor; (d) sensing said first signal on the other of said first conductor and said first current sensor; and (e) associating said first voltage potential with said first changing electrical current when calculating the power usage of said first load; (f) a second current sensor suitable to sense second changing electrical current within a third conductor to said first load; (g) a fourth conductor sensing a second voltage potential provided to said first load; (h) said power monitor superimposes a second signal on one of said third conductor and said second current sensor; (i) sensing said second signal on the other of said third conductor and said second current sensor; (j) associating said second voltage potential with said second changing electrical current when calculating the power usage of said first load.