ABSTRACT
While deŽned differently in Chapter 2, low voltage power cables in this chapter will be those designed to operate at phase-to-phase (VL−L, U) voltages of less than 2 kV. This is done to compensate for some misalignment in standard voltage ratings. In the US standard, rated voltages for low voltage cables are commonly 0 to 600 and 601 to 2,000 volts phase-to-phase (VL−L) based on a grounded “wye” three-phase system (making voltage to ground, Vg = 0.577VL−L). Internationally, a common low voltage rating is 0.6/1 kV, where 1 kV is phase-to-phase (U) and 0.6 kV is phase-to-ground voltage (U0) also based on the same system. There are many exceptions including cables that are rated phase-to-ground. These are generally appropriately marked.
