Conductors with voltage up to 1 kV

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

Conductors with voltage up to 35 kV. Conductors with voltage up to 1 kV

Free technical library

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

Comments on the article

2.2.19. Branch points from current conductors must be accessible for maintenance.

2.2.20. In industrial premises, current conductors of IP00 performance should be located at a height of at least 3,5 m from the floor level or service platform, and current conductors of performance up to IP31 - at least 2,5 m.

Installation height of IP20 and higher performance conductors with insulated busbars, as well as IP40 and higher performance conductors is not standardized. The height of the installation of conductors of any design at a mains voltage of 42 V and below AC and 110 V and below DC is also not standardized.

In rooms visited only by qualified service personnel (for example, in the technical floors of buildings, etc.). installation height of conductors IP20 and higher is not standardized.

In electrical rooms of industrial enterprises, the installation height of current conductors of IP00 and higher performance is not standardized. Places where accidental contact with conductors of IP00 version is possible must be protected.

Conductors must have additional protection in places where mechanical damage is possible.

Conductors and fences placed above the walkways must be installed at a height of at least 1,9 m from the floor or service platform.

Mesh fencing of conductors must have a mesh with cells no larger than 25 x 25 mm.

The structures on which the conductors are installed must be made of non-combustible materials and have a fire resistance limit of at least 0,25 hours.

Nodes for the passage of conductors through ceilings, partitions and walls should exclude the possibility of the spread of flame and smoke from one room to another.

2.2.21. The distance from the current-carrying parts of current conductors without sheaths (IP00 version) to pipelines must be at least 1 m, and to process equipment - at least 1,5 m.

The distance from bus ducts with sheaths (IP21; IP31, IP51, IP65) to pipelines and process equipment is not standardized.

2.2.22. The clear distance between the conductors of different phases or poles of conductors without sheaths (IP00) and from them to the walls of buildings and grounded structures must be at least 50 mm, and to combustible elements of buildings - at least 200 mm.

2.2.23. Switching and protective equipment for branches from current conductors must be installed directly on the current conductors or near the branch point (see also 3.1.16). This apparatus shall be so located and guarded as to prevent accidental contact with live parts. Appropriate devices (rods, cables) must be provided for operational control from the floor level or service platform by devices installed at an inaccessible height. Apparatuses must have features distinguishable from the floor or service platform indicating the position of the apparatus (on, off).

2.2.24. For conductors, insulators made of fireproof materials (porcelain, steatite, etc.) should be used.

2.2.25. Along the entire route of current conductors without protective sheaths (IP00) every 10-15 m, as well as in places visited by people (landing sites for crane operators, etc.), safety warning posters should be fixed.

2.2.26. Measures (for example, insulating spacers) should be provided to prevent unacceptable convergence of the phase conductors between themselves and with the conductor sheath during the passage of short-circuit currents.

2.2.27. The following additional requirements apply to conductors in crane spans:

1. Unshielded conductors without protective sheaths (IP00) laid along trusses should be placed at a height of at least 2,5 m from the level of the bridge deck and the crane trolley; when laying current conductors below 2,5 m, but not below the level of the lower chord of the floor truss, guards should be provided to prevent accidental contact with them from the bridge deck and the crane trolley along the entire length of the current conductors. It is allowed to install a fence in the form of a canopy on the crane itself under the conductor.

2. Sections of current conductors without protective sheaths (IP00) above repair pens for cranes (see 5.4.16) must have guards to prevent contact with live parts from the deck of the crane trolley. Fencing is not required if the current conductor is located above this flooring at a level of at least 2,5 m or if insulated conductors are used in these places; in the latter case, the smallest distance to them is determined based on the repair conditions.

3. Laying of conductors under the crane without the use of special measures of protection against mechanical damage is allowed in the dead zone of the crane. Special protection measures against mechanical damage are not required for sheathed busbars of any design for current up to 630 A, located near the process equipment outside the dead zone of the crane.

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:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Router ZTE 5G Indoor CPE MC8020 10.02.2022

ZTE has released a new high-speed router called 5G Indoor CPE MC8020.

The novelty supports 5G in the band below 6 GHz and the millimeter wave band. The new superantenna technology delivers 15% more gain and 20% faster speed than the previous generation model.

The router complies with the Wi-Fi 6 standard, and the peak data transfer rate reaches 5.4 Gbps. Up to 128 users can be served simultaneously. In the presence of NFC, allowing you to connect to the router with one touch.

The new router received a Qualcomm enterprise-level neural processor. zLink Boost technology automatically combines wireless and wired broadband networks, allowing the device to double the upstream and downstream speeds. Supports OFDMA technology (multi-user version of OFDM digital modulation).

The ZTE 5G Indoor CPE MC8020 is priced at $470.

Other interesting news:

▪ cow compass failure

▪ Five beard hairs

▪ The force of gravity has been refined

▪ Karaoke by Apple

▪ Qualcomm Snapdragon 625, 435 and 425 mobile chips

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Infrared technology. Article selection

▪ article With a sweet paradise and in a hut. Popular expression

▪ article Which Soviet song has been translated into dozens of world languages? Detailed answer

▪ article Engineer for design and estimate work. Job description

▪ article Communication of hardness to gypsum. Simple recipes and tips

▪ article The magic cap and the disappearing coin. Focus secret

Leave your comment on this article:

All languages of this page

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