How does the typical mains power connect in the USA anyway?

Danny D'Amico · 2013-11-18T01:42:15+00:00

Here is a picture of the incoming wires to my main circuit breaker: If we follow those three wires *back* to the nearest transformer, what do they look like (in terms of phase relationship to each other)? If we follow those three wires *forward* to the first circuit breaker, what do they look like (in terms of connection to the literal earth of the ground)? Note: This question is an offshoot of a 220v dryer question; but this question is asked to get to the root of *what* it is that is entering the house in the first place.