Comment Re:"Clocks" (Score 1) 439
Large metropolitan areas know this very, very well. Making sure that the phase angle on both sides of the open disconnect switch you plan to close is essential. Because of the high population density, the current generation must be very close to the customer. The closer you are to the generation, the more current is available. Even a few degrees off can push tremendous currents (40kA+) without any kind of phase to ground fault or phase to phase fault. Substation protection engineers have specialized equipment for just this purpose.