Carrying out such checks is vital.a necessary measure, because when working on disconnected conductive elements, as well as when searching for damage to installations connected to the electrical network, and taking measures to monitor the health of various power supply elements, there is a certain probability of people getting under voltage. In turn, voltage indicators are a tool that can guarantee the safety of health and life of people working in repair and maintenance services.
However, it should be noted that such devicesthey only allow to establish the fact of the presence of voltage, but cannot measure and show its magnitude. Traditionally, voltage indicators are equipped with a light signal, which provides information about the presence of the desired value on current-carrying parts. However, using this simple, but very effective device, one can judge not only whether there is voltage on any one current-carrying part, but also to say that there is no phase-to-phase voltage that can occur between two or more conductive elements.
Modern voltage gauges can be dividedinto two groups. The first includes devices to indicate the absence of the desired parameter in networks and installations up to 1000 volts. The second can be attributed to all other means of protection, which are designed to work with electrical installations of more than 1 kV.
Let's consider each of them in more detail.
Low Voltage Pointer - Device Widecommon in both industrial and domestic conditions. Among modern means of protection up to 1 kV, there are single-pole and two-pole devices. Their fundamental difference consists in the principle of operation: bipolar can show the presence of voltage between two current-carrying elements of an electrical installation, while a single-pole one requires contact with any one conductive part. It should also be noted that the first of the listed devices can be used in networks of both AC and DC, while the latter can only be used to determine the presence of alternating current. In case of contact with a DC network under voltage, a single pole voltage indicator will show a false result. These pointers are recommended to be used to check the secondary voltage circuits, meters, fuses, switches and other elements of the electrical network.
High voltage indicator is used forsimilar purposes in networks over 1 kV. These devices have a structure similar to the means of protection up to 1 kV and includes working, isolating and signal parts. According to the rules of use, when working with such pointers it is necessary to use dielectric gloves.
