Category I of electric meter is intended only for measurement inside an appliance.
Voltage measurements from specially protected secondary circuits fall under the Category I. Signal levels, specialized equipment, equipment with limited energy, circuits powered by controlled low voltage sources, and electronics all use these voltage measurements.
Actually, electrical test and measurement tools are designed for specific applications and conditions. Excessive or erroneous application parameter deviation can result in inaccurate measurements or injury. As a result, there are four primary electrical tool measurement categories: Category I, Category II, Category III, and Category IV.
Measurement Categories are used to rate test instruments based on their ability to withstand a voltage spike applied via a specific resistance. The higher the category, the greater the danger of a high voltage overloading a circuit and causing electrical and physical damage. Generally, the higher the CAT (category) rating, the higher the safety rating.
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