04.07.16
Our specialists regularly face the question from the clients why we recommend grounding made of copper-bonded steel? After all, for the decades, a grounding device was made of black metal, and it seemed there were no problems. Why the decision toleave the traditional grounding was made? Is it new fashion or really essential?
ZANDZ Club expert - Sergey Alexeevich Tolstopyatov, the head of the company "N G N Group" had a chance to face black steel grounding in the Star City. The installation of this facility was published on the event page in the section "Works". The grounding device at the object was carried out of corners of traditional black steel, welded together. At the time of delivery of works, the spreading resistance of an electric current was 4 ohms, after 3 months the value increased to 6 ohms. The reason for resistance changes was connected with the reduction of grounding electrochemical characteristics due to iron rust. Repeated grounding, also made of black steel, mounted and united with the first contour, did not last more than 6 months. In the result, this problem could be solved only through the installation of grounding of copper-bonded steel. The grounding device was made of two ground electrodes installed at the depth of 13.5 meters and 6 meters. The resulting grounding resistance was 2.2 ohms.
The resulting grounding resistance in the Star City
Let's single out the main causes of changing the technologies of grounding device manufacture.
High metal intensity. For industrial facilities the requirements to the value of the spreading resistance of the electric current state that it should be not more than 4 Ohm, 2 Ohm or even 0.5 ohm. To achieve such low values, a large amount of ground electrodes, and as a result, metal is required. Ground electrodes are installed into the ground until the grounding resistance is not reduced to the desired value. Thus, this process takes not only a lot of time to install, but requires a large area for placement. In contrast to black metal, modular grounding of copper-bonded steel is very compact due to the large depth of vertical electrodes. It can be performed as a single point near the walls of the house or basement.
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Grounding scheme for copper-bonded rods and black steel rods
Time-consuming installation. As described above, ground electrodes of ferrous metal are vertically installed into the ground to the depth of not more than 5 meters, due to the fact that the metal is bent and it is impossible to drive the rods into the ground without heavy equipment. As a result, installation of a conventional ground electrode requires a greater number of horizontal ground electrodes, and a lot of digging of trenches, and also welding works for joining metals together. In comparison, a copper-bonded steel electrode can be set to the depth of 30 meters by a simple jackhammer. Due to the thread on the rods, all the components can be joined together without welding, by screwing.
Copper-bonded threaded rod
Maintenance and repair. The main problem of black metal is low resistance to corrosion. In the result of electrochemical treatment of metal, it is destructed and the destruction speed is proportional to the aggressiveness of the soil. In conditions of high humidity and conductivity of soil, this process goes very quickly, disabling the grounding device. With regard to the coppered rods, they have a special copper coating that protects the steel core from premature aging. Such grounding is highly resistant to corrosion and guarantees service life from 30 to 100 years.
Black steel rods covered with corrosion
ZANDZ Experts Club knows the benefits of copper bonded ground electrodes firsthand. In this example, you made sure that the aggressive action of soils, black steel cannot withstand even a minimum service life. Save your energy, time and money. Book a kit of ZANDZ modular grounding right now!
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