 Although the DALI control cable operates at ELV potential, it is not classified as SELV ("Safety" Extra Low Voltage) and must be treated as if it has only basic insulation from mains.This has the disadvantage that the network cable is required to be mains-rated, but has the advantage that it may be run next to mains cables or within a multi-core cable which includes mains power.Also, mains-powered devices (e.g., LED drivers) need only provide functional insulation between the mains and the DALI control wires.