What is wire break protection?
Hello! Answer please:
- What is the maximum voltage in the wire, do I understand correctly, this is 380 V?
- Starting from what voltage a step voltage dangerous for a person is formed when a wire is broken, I know that it is important not to step on a torn 220V wire, there is no step voltage there, but how about 380 V and beyond (+ how many meters should be bypassed)?
- What is the protection of a wire from a break, is it on all wires under voltage dangerous to human life?
Thank you in advance for your answers.
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380 V is the rated line voltage. In fact, always more. What voltage can be in the wire? Overhead lines come in different voltage classes from 0.4 kV, 6, 10, 35 up to 750 kV.
Step voltage is dangerous even at 220 and 380 V. That is, it is not necessary to step on - it is enough to approach an unacceptable distance and the person will be shocked by the current. Outside the premises, you cannot approach a tattered wire closer than 8 meters, and in rooms closer than 4 meters.
Each line has its own defenses against a cliff - here you cannot say in a nutshell. For example, on 6, 10, 35 kV lines, which are often found in settlements, when one wire is broken and it falls to the ground, the line does not turn off - in this mode the line can work for several hours until the maintenance personnel identify the damaged area and disconnect it him from the network. That is, if the wire is broken, it can be energized for a long time, and while the wire is on the ground, it is better to bypass it, since it is not known whether there is voltage on it or not.