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Field research Table 2 — Grounding of gears, Length of the grounding electrode and grounding resistance. Its presence cannot be felt at distance by senses touch, sight, hearing, smell.
It can also be spoken ingrounding of work or provisorywhose objective is to make it possible, without risk of danger, action of maintenance on parts of the installation normally under tension, placed outside of service for this end.
These tensions if applied to the human being, they provoke eletriicas shocks being able to cause ventricular fibrillation. According to Mamede Filho [ instaloes ], in order to function with a performance satisfactory enough and to be insured against risk of fatal accidents, all high- voltage electric installation and of low tension must adequately possess a system of dimensioned grounding for the conditions of each project. One has had the concern about distributing the workmanships amongst the diverse rceder of the region.
Instalacoes eletricas prediais instalacoes eletricas prediai. The linking of connecting rods in parallel reduces the grounding resistance.
Field research Table 1 — Work phases Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms. Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms.
Livro Instalações Eletricas – 15 ed. – Helio Creder | Documents
The NBR norm  establishes the guidelines to the dimensioning and installation of the equipotentialization systems. The bigger the length of the rod the less resistance of grounding, this because the bigger the connecting rod the bigger the surface the current passage, thus diminishing the resistance. In this way, NBR establishes as general rule for protection against electric shocks that the declared principles are assured at the very least, for the joint provisions of basic protection and supplementary protection.
As mais variadas edicoes, novas, seminovas e usadas pelo melhor preco. This measure of protection is destined to prevent that a contact tension of maintaining for a time which can result in risk of dangerous physiological effect for people or animals and, it is based on the performance of a device of automatic cut that detaches the defective installation when it will be able to circulate dangerous intensities through people or animals.
Protection insyalaoes against electric shock Protections against electric shock According to Cadick et al eletrcas electric shock is the physical manifestation that occurs when an electrical current flows through the human body.
Equi-potentialization of the electrical installations. The symptoms may include from a slight sensation of tingling, to violent muscular contractions, cardiac Arrhythmia or damage to the tissues.
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Baixar instalacoes eletricas helio creder pdf livros virtuais. When accidents occur because of electrical shock, there is a considerable probability for it to become fatal.
Congresso Brasileiro de Ergonomia, In a grounding system, it is considered as land resistance the effect of three resistances, knowing: Therefore, for understanding the steps and safe procedures needed to the use of energy and the handling of electrical installations requires the comprehension of electrical risks .
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This will depend mainly on the intensity of the intensity, frequency, time of duration and on the passage of the current through human body .
Insta,aoes is impossible to imagine the present xreder without the electrical system, it is displayed in all the branches of professional activities but electrical energy has also as characteristic the potentiality of causing accidents.
The research results showed that while companies, especially those of larger size, are investing in electrical installations and adequate protection systems, there are still grave problems in the manner of installation and utilization of such systems and in the availability of required documentation. In this context it is eletgicas the concept of touch tension creddr tension of step.
When approaching the subject Protection against Electric Shock, such norm establishes two fundamental principles which are key-ring for the understanding of the rules, procedures and norms and, consequently, to the effectuation of the hazards control inherent to the handling, operation and intervention in electrical webs.
Thus, the protection against electric shocks, still in accordance with NBR understands two lines of defense or two types of protection: In order to perform satisfactorily and be sufficiently protected against the hazard of fatal accidents, every electrical installation needs to have an adequately dimensioned grounding system.
Figure 1 presents a space vision of the distribution of the used mistral space in the research. According to NBR , the prescriptions that translate the basic principles of the applied equi-potentialization to the protection against electric shocks are the following ones: A vida por um fio: This instrument had as greater objective the identification of relative non-conformity to the electric installations that could generate danger to the user, the proper installation and the patrimony, especially as for eetricas systems of protection against electric shocks.
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However, in practice it is not common to use very long connecting rods, which are not simple to embed in the ground. Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at work sites. According to Cadick et al  electric shock is the physical manifestation that occurs when an electrical current flows through the human body. The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: Special care was taken so that the visits were made with the presence of the electrician, engineer or technician of security of the workmanship, in order to preserve the security of the scholarship holder, as well as, also of obtaining refined information.
In the year of one would find registered in this sector of civil construction, 1, employees in all Brazilian territory, being In addition to this norm recently came into force the law n. ANALISYS OF THE RESULTS The majority of the visited workmanships was found in the phase of structure and finishing, as it shows Table 1, as the provisory electric installations are installed in the beginning of the activities in the work site, there were realized that the constructors do not carry through a periodic maintenance in the installations, they are only modified in agreement with the necessities without the existence of a project adjusted for the respective adaptations.
These numbers, however, are on this side of what is expected to find exactly in the considered companies of great transport and demonstrates that the great majority of the enterprises possesses the equipment filled with earth with the elements electrodes, connections and conductors adjusted but they display imperfections in other important items of the norm many times due to knowledge or efficient fiscalization. The accidents risks involving electrical energy become preoccupying due toits seriousness.
The objective of the groundings is to assure without risk of danger the draining of currents of lack and escape for land, satisfying the necessities of security of the people and employees of the installations.
The most used are of 2 and 3 m. In this in case, so that the possibility of dispersion of the connecting rod is used fully is necessary to nail it outside the zone of dispersion of the other, or either, in the region of null potential. However, deficiencies with regard to the installation and maintenance of the stakes and connections were detected that failed to protectagainst damages caused by the aggressive worksite environment.
The chain that enters the grounding system is dispersed in the ground,generating electric tensions. Soon, a grounding system aims at: