Which type of switchgear is categorized as high voltage?

High voltage switchgear is defined as equipment that operates at voltages exceeding 36 kV. This classification is crucial because it pertains to the design, materials, and safety requirements necessary for handling high voltage applications, which carry more significant risks and require more robust insulation and safety measures.

The category of above 36 kV is typically used in substations and industrial applications where large amounts of power are transmitted over long distances. This switchgear is essential for controlling and protecting electrical circuits at these higher voltages, ensuring safe operation and minimizing the risk of electric shock or equipment failure.

The other options represent different voltage classifications: up to 1 kV and less than 100 V are considered low voltage categories, while 1 kV to 36 kV falls under medium voltage. Therefore, the correct classification that defines high voltage switchgear is indeed above 36 kV.