Webinar "Grounding and lightning protection for a private house", page 1

The second webinar of the "Simply about installing grounding and lightning protection" series

Having studied the requirements for grounding and lightning protection in the first webinar, we will proceed to the popular facilities. During the second webinar, we will simply tell you about calculations and installation of grounding and lightning protection for the most popular facility, a private house, a cottage, or a summer cottage. We will give you a full step-by-step instruction: what to start with, what to pay attention to, what difficulties you may face, and how to avoid the common mistakes.

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Grounding in a private house

— It means that I will focus on the points, the areas that have arisen in my practice during installation. I will also share some life-hacks related to grounding and lightning protection, and after that we will see. 

Electrical safety in the TN-C-S system

— Electrical safety in the TN-C-S system. Here, I would like to get back a little bit to the abbreviation. If it is not known for everybody, pardon my French in advance. It means T (Terre - ground), N (Neutre - neutral), and I (Isole - isolated). In GOST, we have such notions as N - neutral conductor, PE - neutral protective conductor, and PEN - combined neutral working and protective grounding conductor. We will use these abbreviations in future, so I want you to understand them better. We can see that we have abbreviations TN-C-S here. Initially, TN-C was the most common subsystem: the neutral working and neutral protective conductors combined in a single conductor throughout the system (C means combined). 

Modular grounding system

— The modular system itself consists directly of a rod, on which we first place the starting tip, which allows entering the soil. Then, the first rod is connected to each subsequent rods using the brass coupling, and the connecting point is processed by the conductive lubricant, which performs two functions: first, it protects the connection point, and, since it is conductive, it improves the electricity transfer from rod to rod. We place a multi-purpose clamp on the last rod, and then I have the photographs to show the attachment to it, i.e. this clamp allows attaching both wire and band, if you, e.g., failed to do it using one rod and you need to get back and install another rod. I would like to say some words about the deep well grounded. If we choose the facility and try to install the traditional grounding the way it was done before: reinforcement or angles 2 meters long plugged into the soil and welded together as a triangle. In this case, if you perform installation on the facility, and the facility has sand or is characterized by poor soil flowing, and you need to reach 30 Ohm for the electricity or 10 Ohm for the gas boiler, which is even more complicated. You have installed the angle, and it shows 10 Ohm, what should you do next? It means that we need to install some optional circuit somewhere and connect them together so that they would demonstrate the total required resistance. In our case, when we use the rod grounding, we can, in theory, make it up to the infinity. In my practice, I could not plug more than 12 rods sequentially, one after another. According to the manufacturer's instructions, these rods can be easily deepened for up to 20 meters without compromising the coating quality, etc. But I can say once more, it depends on the soil. I am often asked about what to do if you get on the stone. In my practice, I got on the stones several times, and you do not need to hurry up, it just slowly slides apart or crushes the stone and so on. If we face the rock outcrop, you cannot do anything about it. I had no chance to see the rock outcrop near Moscow, but in other regions, we usually cut the rod at the soil level and move to the distance where we installed the previous rod, and then begin installing the second one while trying to avoid the rock. And the rod grounding must not be necessarily installed strictly vertical, i.e. we can do it by some angle, if you abut the rock, so that the grounding, for example, would bend. The installation will be more difficult, but you will still obtain the result. I mean that, first of all, we need to reach the desired resistance values.

— Here, you can see the picture of the tip going directly to the guide head. The guide head is twisted into the coupling and being in the coupling it transfers its shock stress directly to the rod and deepens it. 

— Here, in this picture, I would like to show the methods. You can see that the clamp is multi-purpose. You can freely attach to it both the band and the conductor.

— In this case, a 6-m long set is provided. If you need to quickly install grounding in your land plot without a perforating device, then there is an option of installing the grounding using a hammer.

— Here, we have some other structure. You can see that the rods are realized this way. This is a previous rod. It has an opening in the back, wherein the subsequent rod enters. Due to added grooves, they self-press. Since steel is relatively soft, to avoid crushing this part and then the rod springing out, we have couplings made of stainless steel, which are placed on the subsequent rods, and then the next rod is inserted. By self-pressing, the rods are retained well, do not spring out and do not break in this place.

— To install this rod, there is a peg in the kit, which is inserted inside the rod in the same way. The strike is made on it directly so that we would not break the rod tail and could install the next rods. One more time: the first rod has the sharp end, and it does not need the starting tip. It can be freely placed into the soil. Then the hub goes, that does not let this opening break and helps pressing the next rod during the strike. And the peg itself which we strike during the grounding installation.
 

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Useful materials for designers:

• Webinars with participation of lead experts of the industry
• All for calculation of the earthing and lightning protection
• Useful materials: articles, recommendations, examples
   

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