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| The current The rails The earth The personnel The metalwork The metal parts The faulty section | running leaving isolated distributed exposed working energised | by circuit breaks the train to touch by broken conductor on the railway along the railway in one direction |
The current leaving the train – ток «стекает» с поезда
The rails running in one direction – рельсы, идущие в одном направлении
The earth distributed along the railway – заземление распределено вдоль жд
The personnel working on the railway – персонал, работающий на жд
The metalwork exposed to touch – незащищенные от прикосновения металлоконструкции.
The metal parts energized by broken conductor – металлические части оказываются под напряжением в случае обрыва проводника.
The faulty section isolated by circuit breaks – поврежденный участок изолируется выключателями.
Ex.3. Before listening to the text below answer the questions:
1. Why is it important to ground wires?
To avoid interference by keeping certain wires parallel to each other.
2. What are safety rules when installing grounding system?
You must be aware of resistance between terminals. The continuous current of electricity must also be kept in mind. You should know the current level that will drive through a wire.
3. How does soil condition effect grounding installation?
Consider the types of materials you will use for the installation
Ex.4. Listen to the text and fill in the gaps.
| soil, important, electricity, components, wire, condition, materials, grounding, install. |
Installing a grounding system
When installing a grounding system keep the basic components in mind. Consider the soil condition where the system will be installed. You will have to create ditch(яма, канава) to install the system. The condition of the soil will determine how you proceed with this step. Consider the types of materials you will use for the installation. A ground wire is a typical part of the system. Also, bonding wire and a footer are important elements. A panel bond is necessary to connect the components system to the electrical panel. You must be aware of resistance between terminals. The continuous current of electricity must also be kept in mind. You should know the current level that will drive through a wire. Remember to avoid interference by keeping certain wires parallel to each other. Also, certain grounding must not be placed within its sphere of influence.
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