Voltage indicators - instruments to guard the safety of people

Voltage indicators represent portable devices that serve to establish the presence or absence of voltage at various current-carrying parts of mechanisms and machines, as well as the elements of the electrical network.

The Carrying out of such checks is a vital exercise because when working on the disconnected conductive elements and if you find damage to the installations connected to the mains, and carrying out activities for the control of serviceability of the various elements of the power supply there is a certain probability that people under stress. In turn, the voltage indicators are a tool that can guarantee the security of life and health of persons employed in repair and maintenance services.

Note, However, that such devices allow only to establish the fact of the presence of voltage, but can not measure and display its value. Traditionally, the voltage indicators are equipped with light signal, which provides information about the availability of the required quantity on the current-carrying parts. However, through this simple but very effective device  can be judged not only on whether the voltage on any single conductor parts, but to say that no phase-to-phase voltage that can occur between two or more conductive elements.

The Modern signs of stress can be divided into two groups. The first group includes devices to indicate the absence of the desired option in the networks and installations up to 1000 Volts. The second include all other means of protection that is designed to work with electrical installations exceeding 1 kV.

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Let's Consider each of them in detail.

The pointer to the low - voltage device, widely used in both industrial and household conditions. Among the modern means of protection up to 1 kV distinguish unipolar and bipolar devices. Their fundamental difference is in the principle: bipolar can show the presence of voltage between the two conductive elements of the electrical installation, as required single pole contact with any conductive part. It should also be noted that the first of these devices can be used in the networks of both AC and DC, while the second can only be used to determine the presence of alternating current. In case of contact with the DC circuit, under voltage, single-pole voltage tester will show a false result. Presents pointers is recommended for checking the secondary voltage circuits, meters, fuses, switches and other elements of the electrical network.

The Pointer the high voltage is applied for similar purposes in networks above 1 kV. These devices have a structure similar to protection up to 1 kV and includes the working isolation and signal parts. According to the terms of use, when working with these pointers, you must use insulating gloves.