Equipment inside usually includes isolating switches, circuit breakers, and residual current devices (RCDs). Supplies power to specific buildings or floors. Power Distribution Equipment is a term generally used to describe any apparatus used for the generation, transmission, distribution, or control of electrical energy. This section concentrates upon commonly used power distribution equipment: Panelboards, Switchboards, Low-Voltage Motor Control. Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. At this. ABB's medium voltage switchgear (1 kV to 52 kV according to the IEC standards) are designed to connect and protect an evolving grid.