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A 120V AC distribution panel distributes single-phase branch circuits from a defined line-to-neutral or line-to-line source. The panel rating, feeder, neutral, grounding, breaker family, available fault current and enclosure must all be verified. “120 V” describes the nominal circuit voltage;…

Medium-voltage switchgear controls and protects electrical distribution systems between low-voltage utilization and high-voltage transmission. It is used in utility substations, factories, data centers, mines, buildings and renewable-energy plants. This guide compares air- and gas-insulated, metal-clad and ring-main designs and explains…

The power factor of a motor describes how effectively the motor converts apparent electrical power into real mechanical output. Induction motors normally have lagging power factor because their magnetic field requires reactive current. The value changes with load, voltage, speed,…

To know whether power factor is leading or lagging, determine the direction of reactive power and the phase relationship between voltage and current. Inductive loads such as motors and transformers normally draw lagging current. Capacitors normally supply leading reactive current.…

An SF6 circuit breaker is a high-voltage switching device that uses sulfur hexafluoride gas for insulation and arc interruption. The gas has high dielectric strength and can capture free electrons, allowing a compact interrupter to withstand recovery voltage after current…

An air switch circuit breaker is an air-insulated switching and protection device that uses the surrounding air as its arc-insulation medium. The term is used for several low-voltage devices, including air circuit breakers, panel air switches and manually operated disconnects.…