Grounding and electrical safety protective measures. Main ground bus

Free technical library

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

Section 1 General Rules

Grounding and electrical safety protective measures. Main ground bus

Free technical library

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

Comments on the article

1.7.119. The main ground bus can be made inside the input device of the electrical installation with voltage up to 1 kV or separately from it.

Inside the input device, the PE bus should be used as the main ground bus.

When installed separately, the main ground bus must be located in an accessible, convenient place for maintenance near the input device.

The cross section of a separately installed main ground bus must be at least the cross section of the PE (PEN) conductor of the supply line.

The main ground bus should usually be copper. It is allowed to use the main earthing bar made of steel. The use of aluminum tires is not allowed.

The busbar design shall provide for the possibility of individual disconnection of the conductors attached to it. Disconnection must only be possible with the use of a tool.

In places accessible only to qualified personnel (for example, switchboard rooms of residential buildings), the main earth bus should be installed openly. In places accessible to unauthorized persons (for example, entrances or basements of houses), it must have a protective shell - a cabinet or box with a key-lockable door. A sign must be placed on the door or on the wall above the tire.

1.7.120. If the building has several separate inputs, the main ground bus must be made for each input device. If there are built-in transformer substations, the main ground bus must be installed near each of them. These buses must be connected by a potential equalization conductor, the cross section of which must be at least half the cross section of the PE (PEN) conductor of that line among the substations outgoing from the low voltage switchboards, which has the largest cross section. Third-party conductive parts may be used to connect several main earth busbars if they comply with the requirements of 1.7.122 for the continuity and conductivity of the electrical circuit.

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

Red phosphorus to increase the capacity of lithium batteries 01.08.2020

Scientists at the Argonne National Laboratory have made progress in creating a lithium-ion battery with increased capacity. The new development promises to increase the energy capacity of the anode material by a factor of ten and lead to batteries that are more capacious than today.

Modern lithium-ion batteries use a graphite anode. It is a battery-stable material. It does not crack even after 1000 charge and discharge cycles, although each such cycle is accompanied by saturation of the graphite anode with lithium and its subsequent return. And everything would be fine, only graphite has a relatively low energy capacity.

To gradually increase the capacity of lithium-ion batteries, new anode materials are needed. Two of the most promising materials are considered as such materials - silicon and phosphorus. Each of them has a theoretical energy capacity at least 10 times greater than graphite. Silicon anodes no longer seem like a fantasy and even promise to get into commercial products no later than in five years. But researchers at Argonne National Laboratory don't trust the material.

The scientists first made a composite anode using particles of black and then red phosphorus. Particles of phosphorus are crushed to a micrometer size and then combined with carbon particles of the same size. The resulting material showed a Coulomb efficiency of over 90%, which paves the way for commercial production of the composite anode.

Other interesting news:

▪ DNA nano thermometer

▪ Ancient people poisoned with heavy metals

▪ tsunami gifts

▪ The fastest plant

▪ The appearance of the child can be edited at the gene level

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site for those who like to travel - tips for tourists. Article selection

▪ article Automatic interplanetary stations Voyager. History of invention and production

▪ article Why do some people have dwarfish growth? Detailed answer

▪ article Soap tree. Legends, cultivation, methods of application

▪ article Cement - putty for the aquarium. Simple recipes and tips

▪ article Overhead power lines with voltage above 1 kV. Passage of overhead lines through uninhabited and hard-to-reach areas. 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