What happens to EMFs when two transmission lines are located in close proximity?
There are usually three phases (or wires) that make up a typical overhead transmission line. Phase lines are spaced so that air can act as insulation between them to prevent power loss. In addition, a certain level of separation is necessary for safety of workers who may have to repair the lines. When another line is located along the same corridor, the magnetic fields of each phase tend to be cancelled out by the magnetic fields of the adjacent line. The closer the lines are together, the more complete the cancellation. Additionally, the effects of magnetic fields dissipate with distance.
