How many lines?

• Inexpensive devices can be obtained, such as the Kill-A-Watt, to monitor a single outlet
• For multiple lines, or designing a monitor for a breaker (as opposed to an outlet), A/D converters can be found in inexpensive controllers such as the PIC, which comes with multiple ADC inputs
• However, even a typical home may have a breaker box with dozens and dozens of breakers. I have more than 1 breaker box, the larger containing 40 breakers