2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16
Any electrical appliance can break down. If he just stopped working - it's half the trouble. Worse, if the malfunction leads to the ingress of electrical voltage on the elements of its design, which the user considers safe. Inadvertently touching such an object, a person will be subjected to electric shock, may be injured or worse…
What is protective earthing
With an internal break in the conductor, it becomes possible for it to touch the body of the electrical panel or other device, and in this case the latter will be a mortal danger, invisible, and therefore doubly terrible. To avoid such situations, grounding devices are used. They are mounted very simply, but they must certainly meet a number of requirements.
Outdoor equipment, as well as any equipment located in wet areas, must be grounded and grounded if the supply voltage exceeds 42 V AC, or 110 V DC. The same applies to all metal non-current-carrying parts of power tools, boxes, shields andstructures in which the cable is routed.
What does grounding consist of
Grounding devices consist of two main parts.
The first of these is called a grounding conductor, and most often it is a natural building element, such as fittings, buried pipelines and other parts that provide reliable and repeated contact with the ground. If, due to some circumstances, such structures are absent or unavailable, artificial grounding devices are used. They are steel corners dug into the ground to a depth of at least 60 cm with a side size of 5 cm and a thickness of at least 4 mm. The length of each of these elements must be at least 3 meters, they go deep into the ground, then steel strips are welded to them, to which the conductors are fastened, that is, the second part of the structure that ensures electrical safety.
Earth Requirements
The resistance of the grounding device should be minimal, so the requirements for contact reliability are very high. Its main purpose is to create conditions for turning off the power supply in the event of contact of the current-carrying part with elements that under normal conditions should not be energized. Human life often depends on how quickly an emergency blackout occurs.
Ground condition monitoring
In order to control the degree of electrical safety,periodic measurement of the grounding device. The physical meaning of this procedure is to determine the actual resistance through which the current will flow in an emergency. For this, special devices are used, equipped with control probes and representing accurate ohmmeters (for example, MRU-101).
At enterprises, specific officials are responsible for electrical safety, usually the chief power engineer, the head of the labor protection service and, of course, the management. In their own apartment, country house or private building, grounding devices are controlled by the owners of the property.
Be careful and careful!
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