What must voltage detectors have to ensure safety?

Voltage detectors must have a measurement category for the job to ensure safety because this categorization defines the proper application and the level of transient overvoltage that the equipment can safely withstand. Measurement categories (often referred to as CAT ratings) indicate the environment in which the tool is designed to operate, ranging from basic household circuits to high-energy environments such as industrial settings.

The measurement category ensures that the voltage detector can accurately and safely measure voltage without the risk of failure or danger to the user. This is crucial because using a voltage detector in an environment for which it is not rated could result in inaccurate readings or equipment damage, leading to potentially hazardous situations for the technician or engineer.

While personal protective equipment, backup power supply, and calibration certificates may enhance safety or functionality, it is the measurement category that directly relates to the operational safety of the voltage detector itself in the specific application for which it is used.