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Voltage detectors and voltage presence indicators / warning devices are electronic equipment widely used as protective devices against electrical risks, their main purpose being to detect and indicate the presence of voltage in low, medium and high voltage electrical installations.
Voltage detectors are devices designed to check the presence / absence of voltage in all types of electrical installations. The detectors indicate the presence of voltage in the tested installation both visually and acoustically.
Voltage detectors are manufactured in accordance with the requirements of standard SR EN 61243 and are permanently in stand-by mode, ready to perform the voltage presence / absence check.
Voltage detectors for low voltage electrical installations are multifunctional devices (multitesters), designed so that, in addition to detecting and indicating the presence of voltage, they can also check the phase sequence in three-phase low voltage networks, check the continuity of an electrical circuit, detect insulation faults or measure resistance values.
Voltage detectors for medium and high voltage electrical installations are specialised devices that can be used in dry weather or during precipitation, to safely perform the voltage presence / absence check using insulating sticks suitable for the installation and the weather conditions.
For this type of detector it is mandatory to test the functionality of the device before each use. The test is performed by pressing a test button, which triggers the acoustic and light signals of the detector, confirming that the battery is properly charged and that the electronic circuits are working.

Detectors for medium and high voltage must be tested both when they are put into service and periodically, at the intervals set by the manufacturer.
Periodic tests must be carried out under special conditions, in laboratories accredited for such tests by RENAR, the Romanian National Accreditation Body.