After reading several posts I have two questions.I have been keeping track of my usage with a clamp-on ammeter on both the main power lines and each circuit. Let me give you a example of a reading on the 3 main lines, L1= 21.6 L2 =4.5 Neutral =8.3, from the posts I read this is out of whack. Second question do I add all these together to get total usage, and then do I drop down to the breakers and measure the black wires all together to see if they match