Radial ground electrode: reliability at a shallow depth

Radial ground electrode: reliability at a shallow depth

  • 14.03.2019

Usually everybody tries to bury the rod to the maximally possible depth when arranging grounding. Such an approach is connected with the need to provide low ground resistance throughout the year. The ground doesn't freeze at a great depth, besides; there are layers rich in ground waters, characterized of low resistivity. The disadvantage of such approach is the need of drilling if there are hard rocks. Besides, there exist types of soils, for example peat layers, where electric resistivity at a great depth is lower, than close to the surface.

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Video. Installation of grounding in the basement of a single-family house

Video. Installation of grounding in the basement of a single-family house

  • 13.03.2019

Installation of copper-bonded grounding in a basement of a single-family house is a great solution with many positive aspects. It is acceptable by the regulatory documents, easy to install, doesn't require place outside the house, provides stable low resistance to current spreading in the ground. Bikmulin Rinat Mahmudovich, member of ZANDZ Club of Experts, shared the video of ZZ-000-015 grounding kit installation in the basement of a single-family house. The received grounding device resistance - 8.62 Ohm. Excellent result!

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Grounding for a helicopter deck

Grounding for a helicopter deck

  • 12.03.2019

To provide safe flight of an aircraft, it is necessary to ensure an uninterrupted functioning of communication systems and also meteorological conditions tracking system. One of obligatory conditions is grounding of these systems' equipment. Our ZANDZ Technical Center received a request for a calculation of functional grounding for a helicopter deck, in particular for operation of radio equipment ...

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Two-wire method of resistance measurement

Two-wire method of resistance measurement

  • 06.03.2019

The method of measuring resistance when one wire from the measuring unit goes to the grounding and another to the metal rod buried into the ground is considered to be the simplest and less precise, that is why it is rarely used. However there are applications when it is necessary to get an estimation of the resistance value in the conditions of lack of free space for the second rod. Two-wire method demonstrates its advantages here.

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Lightning protection and grounding of a movable electric installation

Lightning protection and grounding of a movable electric installation

  • 06.03.2019

Movable electric installations which allow to solve local needs in electric energy become more and more important. However, these installations require reliable grounding, which must be counted every time depending on the ground, and, of course, lightning protection. Our ZANDZ Technical Center got a request to solve the task on choosing equipment on lightning protection and grounding of such a ...

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Why rod lightning rod protection zone is of the cone shape?

Why rod lightning rod protection zone is of the cone shape?

  • 04.03.2019

The answer to this question could be given even at the times of Franklin and Lomonosov. The experiments showed that lightning is a giant long spark. Its analog could be received at the laboratory even in XVIII century with the help of an already existing induction machine. The best of them gave voltage of hundreds kilovolts - quite enough for the formation of sparkles dozens of centimeters long. Such a physical model can give base for a high-quality analysis.

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Grounding resistance measuring with classical three and four-wire methods

Grounding resistance measuring with classical three and four-wire methods

  • 01.03.2019

When we talk about security of people, it is preferable to use measuring methods which had been used for dozens of years. Talking about grounding, such a method is measuring of resistance with the help of combination of amperemeter and voltmeter (recommended GOST R 50571.16-2007). Sometimes this method is called "three-wire" (or "three-clamp"). There exists its more precise modification called "four-wire" ("four-clamp") method. As a rule, both methods can be implemented in one measuring device.

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NEW CERTIFICATE OF CONFORMITY OF ZANZDZ PRODUCTS

NEW CERTIFICATE OF CONFORMITY OF ZANZDZ PRODUCTS

Dear colleagues, we would like to let you know that we recieved a new certificate of comformity of ZANDZ products for building grounding and lightning protection systems.

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LIGHTNING PROTECTION OF A BASE PETROL CENTER IN THE SIBERIAN FEDERAL DISTRICT

LIGHTNING PROTECTION OF A BASE PETROL CENTER IN THE SIBERIAN FEDERAL DISTRICT

Base pentrol centers refer to explosive and flammable objects. A lightning strike may bring to the inflammation of petroleum in the capacities and further to an explosion. That is why, it is important to perform a reliable lightning protection. Our objects are protected from lightning by free-standing lightning rods.

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DIFFERENT TYPES OF GROUND ELECTRODES IN DIFFERENT SOIL TYPES

DIFFERENT TYPES OF GROUND ELECTRODES IN DIFFERENT SOIL TYPES

Not so long ago, not many people thought about materials to make ground electrodes. The ordinary, "black" steel was mainly used. The result was the same - grounding had been working for 10 years maximum after what, corrosion, eating the major part of the grounding device made inefficient.

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HOW MUCH A BIM-PROJECT COSTS?

HOW MUCH A BIM-PROJECT COSTS?

The Moscow committee on the price policy in building and state expertise of projects published an order from 10.12.2018 № МКЭ-ОД/18-56 "About confirmation of "Methodological recommendations on the calculation of design cost when using technology of information modelling, carried out with the fundrising of Moscow city budget".

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LIGHTNING PROTECTION OF THE MALY THEATRE

LIGHTNING PROTECTION OF THE MALY THEATRE

The state acamedic Maly theeatre of Russia is one of the oldest Russian theatres, which played the outstanding role in the development of Russian national culture. The comples of theatre buidlings is located in the center of Moscow.

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WEBINAR ON PECULIARITIES OF LIGHTNING PROTECTION IN MOUNTAINOUS REGION

WEBINAR ON PECULIARITIES OF LIGHTNING PROTECTION IN MOUNTAINOUS REGION

On 27 February at 11:00 (Moscow time) we will hold the webinar "Peculiarities of lightning protection in mountainous region".

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WHY LONG VERTICAL GROUND ELECTRODES ARE REQUIRED?

WHY LONG VERTICAL GROUND ELECTRODES ARE REQUIRED?

Short metal rods - about 3 m long, placed at the depth of not more than 0,5 m are often chosen when projecting grounding in the conditions of the Russian midland. Besides, rods of this length are enough in order to reduce the influence of freezing and drying of the ground on the grounding resistance. But in order to provide required values of grounding resistance, it is required to drive at least 3 rods into the ground. They are placed at the distance, approximately equal to the length of the rods. In the result, grounding occupies a significant area.

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LIGHTNING PROTECTION OF AN ELECTROTECHNICAL PLANT

LIGHTNING PROTECTION OF AN ELECTROTECHNICAL PLANT

According to AD, factories, if there are no explosive zones, refer to the third category of lightning protection. The class of explosion risk at this object is B-IIa, correspondingly it is necessary to carry out requirements to the 2 category. The designer or the customer will choose between the use of lightning rods or lightning mesh. The customer chose the latter for this object. Designing the lightning protection system with a lightning mesh, it is necessary to consider necessary details of the regulatory documents.

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EXAMPLE OF CALCULATION. LIGHTNING PROTECTION OF A HOTEL IN SYRIA

EXAMPLE OF CALCULATION. LIGHTNING PROTECTION OF A HOTEL IN SYRIA

Not long time ago we published a news of lightning protection of a hotel. It doesn't mean we will repeat ourselves, because a hotel we will be talking about is located in Syria, that's why its operation conditions are special, climatic at least.

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UNIQUE BOOKS FOR LIGHTNING PROTECTION DESIGNERS

UNIQUE BOOKS FOR LIGHTNING PROTECTION DESIGNERS

Lightning is a natural phenomenon which is still understudied. You can buy unique books of E.M.Bazelyan which contain useful, interesting and detailed information about peculiarities of lightning, its impact on various objects, protection measures and other nuances.

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UNIFICATION OF GROUNDING FOR LIGHTNING PROTECTION WITH GROUNDING FOR ELECTRIC INSTALLATIONS

UNIFICATION OF GROUNDING FOR LIGHTNING PROTECTION WITH GROUNDING FOR ELECTRIC INSTALLATIONS

Necessity to electrically connect the grounding contour of lightning protection, installed directly in the building with the grounding contour for electric installations, written in the existing regulatory documents (EIC). Quotation: "Grounding devices for protective grounding of electrical plants in buildings and structures, as well as lightning protection of the 2nd and 3rd category for buildings and structures, as a rule, should be common". The 2nd and 3rd categories are most widespread, and 1 category includes explosive objects to the lightning protection of which the requirements are very high. However, the phrase "as a rule" presumes the possibility of exceptions.

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SCREENED CHAMBER GROUNDING

SCREENED CHAMBER GROUNDING

  • 28.01.2019

Screened camera is a room for researches of bioelectric phenomena, the walla of which are shielding the chamber content (living organisms, units) from the affect of external electro-magnet fields. Resistance of the grounding device for such chambers should be 4 Ohm maximum. The ZANDZ Technical Center has recently received a request to calculate grounding for one of such screened chambers. Let's study the solution offered by our specialists.

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VIDEO. THUNDERSTORM IN MOSCOW ON THE EPIPHANY DAY

VIDEO. THUNDERSTORM IN MOSCOW ON THE EPIPHANY DAY

On the Epiphany night, 19 January 2019, Moscow citizens became the witnesses of a wonderful phenomenon - a thundersnow. There appeared video proofs of this rare phenomenon in social networks. Novody wonders when there is a spring thunderstorm with rain, but a thunderstorm in winter with snow - it was unexpected.

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INSTALLATION OF GROUNDING AT A NOVOSIBIRSK HOSPITAL

INSTALLATION OF GROUNDING AT A NOVOSIBIRSK HOSPITAL

We always try to show the site visitors our reports about the arrangement of grounding and lightning protection systems, installed by our partners. This time we present you a photo report about installation of grounding at the State Novosibirsk Regional university hospital. At the present time, it is one of the largest multi-speciality medical and preventive treatment institution in volumes and abilities of mdiagnostic and treatment assistance not only in the Siberian Federal District, but in the whole Russian Federation.

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EXAMPLE OF CALCULATION. GROUNDING OF A HOSPITAL IN NOVOSIBIRSK

EXAMPLE OF CALCULATION. GROUNDING OF A HOSPITAL IN NOVOSIBIRSK

Hospitals and medical center are the most responsible objects from the point of view of grounding quality. To ensure electric safety when using equipment in medical premises, a grounding device with a low resistance value is required. It is taken according to the Technical memo № 24/2009 of the Assosication "Roselectromontazh" and must be not more than 2,5 Ohm and for import equipment - up to 2 Ohm.

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TAGS ON ZANDZ SITE

TAGS ON ZANDZ SITE

Dear colleagues, we are constantly trying to make our site maximally comfortable for visitors. There is a field "Tags:" in all our news with the help of which it is possible to sort news on the topic you are interested in "in our click". For example, there is a tas "SPD" in the news about SPD and if to "click" on it, you can see the selection of news about this equipment.

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GROUNDING AND LIGHTNING PROTECTION OF AN ASPHALT-CONCRETE FACTORY IN THE CRIMEA

GROUNDING AND LIGHTNING PROTECTION OF AN ASPHALT-CONCRETE FACTORY IN THE CRIMEA

Asphalt-concrete factory buildings are metal structures which can be used as natural lightning rods. But sometimes customers require to protect all equipment located on the territory by free standing lightning rods. ZANDZ Technical center has recently recieved such a task. Let's consider what solution was offered by our specialists.

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WE CONGRATULATE YOU ON WINTER HOLIDAYS! :)

WE CONGRATULATE YOU ON WINTER HOLIDAYS! :)

Take congratulations and see our holiday schedule

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