Primary distribution systems operate at higher voltages, typically ranging from 11kV to 33kV, and are responsible for moving electricity from substations to local transformers or large industrial users. Secondary distribution systems take this power and step it down to a much lower, safe voltage (e.g., 230V or 400V) for use in homes, small businesses, and offices. The distinction is crucial for ensuring power is delivered at the appropriate voltage for different types of consumers.