What is Voltage Class?
Voltage Class is a classification system used in the electrical industry to define voltage ranges for power systems and equipment. These classes help electricians determine the correct components, insulation ratings, and safety procedures based on the voltage level in use.
Typically, voltage classes are divided into Low Voltage (LV), Medium Voltage (MV), and High Voltage (HV), with further subdivisions depending on regional standards. For example, in residential applications, low voltage generally refers to voltages below 1,000 volts AC, while commercial and industrial settings may deal with medium or high voltage systems. These distinctions are crucial for ensuring the appropriate selection of circuit breakers, wiring, transformers, and personal protective equipment (PPE).
Electricians rely on voltage classes not only for selecting components but also for implementing safe work practices. A system’s voltage class dictates approach boundaries, required training levels, and PPE categories—vital for avoiding arc flash hazards or electrical shock during maintenance or installation tasks.
