Intersections and convergence of overhead lines with engineering structures

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Encyclopedia of radio electronics and electrical engineering / Electrician

Section 2. Sewerage of electricity

Overhead power lines with voltage up to 1 kV. Intersections and convergence of overhead lines with engineering structures

Free technical library

Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

Comments on the article

2.4.90. When crossing and parallel following overhead lines with railways and roads, the requirements set forth in Ch. 2.5.

Crossings can also be carried out using a cable insert in the overhead line.

2.4.91. When approaching overhead lines with highways, the distance from the wires of the overhead line to road signs and their supporting cables must be at least 1 m. The supporting cables must be grounded with a grounding device resistance of not more than 10 ohms.

2.4.92. When crossing and approaching overhead lines with contact wires and carrying cables of tram and trolleybus lines, the following requirements must be met:

1) Overhead lines should, as a rule, be located outside the area occupied by contact network structures, including supports.

In this area, the overhead line supports should be of the anchor type, and the uninsulated wires should be double fastened;

2) the wires of the overhead line should be located above the supporting cables of the contact wires. The wires of the overhead line must be multi-wire with a cross section of at least: aluminum - 35 mm2, steel-aluminum - 25 mm2, the SIP carrier core - 35 mm2, the cross section of the SIP core with all the carrier conductors of the bundle - at least 25 mm2. Connection of wires of overhead lines in crossing spans is not allowed;

3) the distance from the wires of the overhead line with the largest sag must be at least 8 m to the head of the rail of the tram line and 10,5 m to the carriageway of the street in the area of the trolleybus line.

In this case, in all cases, the distance from the wires of the overhead line to the carrier cable or contact wire must be at least 1,5 m;

4) crossing overhead lines with contact wires at the locations of the crossbars is prohibited;

5) joint suspension on supports of trolleybus lines of contact wires and wires of overhead lines with a voltage of not more than 380 V is allowed subject to the following conditions: the supports of trolleybus lines must have mechanical strength sufficient for hanging wires of overhead lines, the distance between the wires of overhead lines and the bracket or device for attaching the supporting cable of contact wires must be at least 1,5 m.

2.4.93. When crossing and approaching overhead lines with cable cars and elevated metal pipelines, the following requirements must be met:

1) The overhead line must pass under the cable car; the passage of overhead lines over the cable car is not allowed;

2) cable cars should have walkways or nets below to protect overhead lines;

3) when passing overhead lines under the cable car or under the pipeline, the wires of the overhead lines must be at a distance from them: at least 1 m - with the smallest sag of the wires to the walkways or fencing nets of the cable car or to the pipeline; not less than 1 m - with the largest sag and the largest deviation of the wires to the elements of the cable car or to the pipeline;

4) when crossing the overhead line with the pipeline, the distance from the wires of the overhead line with their largest sag to the pipeline elements must be at least 1 m. The overhead line supports that limit the span of the intersection with the pipeline must be of the anchor type. The pipeline in the crossing span must be grounded, the resistance of the grounding conductor is not more than 10 Ohm;

5) when parallel following the overhead line with a cable car or pipeline, the horizontal distance from the wires of the overhead line to the cable car or pipeline must be at least the height of the support, and in cramped sections of the route with the greatest deviation of the wires - at least 1 m.

2.4.94. When approaching overhead lines with fire and explosion hazardous installations and airfields, the requirements given in 2.5.278, 2.5.291 and 2.5.292 should be followed.

2.4.95. The passage of overhead lines up to 1 kV with insulated and non-insulated wires is not allowed on the territories of sports facilities, schools (general education and boarding schools), technical schools, preschool institutions (nurseries, kindergartens, orphanages), orphanages, children's playgrounds, as well as on the territories of children's health camps.

In the above territories (except for sports and playgrounds), the passage of VLI is allowed, provided that the zero conductor of the SIP must be isolated, and its total conductivity must be at least that of the phase conductor of the SIP.

See other articles Section Rules for the installation of electrical installations (PUE).

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Primium Seneca keyboard 05.05.2024

Keyboards are an integral part of our daily computer work. However, one of the main problems that users face is noise, especially in the case of premium models. But with the new Seneca keyboard from Norbauer & Co, that may change. Seneca is not just a keyboard, it is the result of five years of development work to create the ideal device. Every aspect of this keyboard, from acoustic properties to mechanical characteristics, has been carefully considered and balanced. One of the key features of Seneca is its silent stabilizers, which solve the noise problem common to many keyboards. In addition, the keyboard supports various key widths, making it convenient for any user. Although Seneca is not yet available for purchase, it is scheduled for release in late summer. Norbauer & Co's Seneca represents new standards in keyboard design. Her ... >>

The world's tallest astronomical observatory opened 04.05.2024

Exploring space and its mysteries is a task that attracts the attention of astronomers from all over the world. In the fresh air of the high mountains, far from city light pollution, the stars and planets reveal their secrets with greater clarity. A new page is opening in the history of astronomy with the opening of the world's highest astronomical observatory - the Atacama Observatory of the University of Tokyo. The Atacama Observatory, located at an altitude of 5640 meters above sea level, opens up new opportunities for astronomers in the study of space. This site has become the highest location for a ground-based telescope, providing researchers with a unique tool for studying infrared waves in the Universe. Although the high altitude location provides clearer skies and less interference from the atmosphere, building an observatory on a high mountain poses enormous difficulties and challenges. However, despite the difficulties, the new observatory opens up broad research prospects for astronomers. ... >>

Random news from the Archive

Six channel 5.1 headphones 14.04.2004

An interesting novelty has appeared in the Rare Mono Shop online store - 5.1 type headphones with a built-in amplifier and sound processor.

5.1 USB Headphones are connected to a computer via a USB interface. "Phones" provide a realistic environment, thanks to the additional speakers located on the right and left "ear" side, so the total number of speakers is 6 pieces.

Output power - 100 mW x 2 channels + 50 mW x 4 channels, reproducible frequency range - 20 Hz ... 20 kHz, headphone weight - 100 grams. The package includes WinDVD with support for 6-channel mode. The cost of "volumetric" headphones is 76 USD.

Other interesting news:

▪ Australian city powered by solar energy

▪ Connecting with loved ones helps you live longer

▪ Secret passages found in the Great Wall of China

▪ coffee protects the heart

▪ Organic conductor sensor

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Measuring equipment. Article selection

▪ article A scammer sits on a scammer and drives a scammer. Popular expression

▪ article Which country in the world is the most read? Detailed answer

▪ article Silvering of metals. HAM Tips

▪ Article Polishing iron. Simple recipes and tips

▪ article Norms of acceptance tests. Measuring voltage transformers. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews