You’ve read about all of the elements of a circuit; now it’s time to look at realworld applications.
Looking at the photo of a typical residential power panel, coming from the top, you’ll see the two hot legs (A) feeding the main breaker bus bars (C). These red and black wires are slightly larger than the rest as they’re a larger gauge (I’ll discuss this in a little bit) to handle the total ampacity of the box (75 amps).
A standard power panel in an American apartment building. Something, as you shoot on various locations, you’ll see on a constant basis. Here, I’ve removed the protective faceplate to get a look at what is happening inside the box.
Looking back at the picture of the power panel, behind ...