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According to NBR , elericas prescriptions that translate the basic principles of the applied equi-potentialization to the protection against electric shocks are the following ones: Figure 1 presents a space vision of the distribution of the used mistral space in the research. In the year of one would find registered in this sector of civil construction, 1, employees in all Brazilian territory, being Baixar instalacoes eletricas helio creder pdf livros virtuais.
The analysis of the data was made using the Microsoft Excel and a data base developed for such in the Microsoft Access. The step tension can provoke serious damages to a instxlaoes due to the current levels and tension that can be attained . Equi-potentialization of the electrical installations.
Livro helio creder instalações eletricas pdf
Livro instalacoes eletricas helio ccreder em pdf livros no. Instalacoes eletricas prediais instalacoes eletricas prediai. It is impossible to imagine the present world 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.
Basic specifications for the grounding system. The chain that enters the grounding system is dispersed in the ground,generating electric tensions. 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.
In view of the described aspects above the objective of this research is crerer the used systems of equi-potentialization used at the vertical worksites of the city of Recife, as well as analyzing its conformity with the effective norms, aiming at the control of the electric risks and to provide the reduction of the number of accidents in the civil construction sector.
The majority of the visited inwtalaoes 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.
Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms.
The NBR norm  establishes the guidelines to the dimensioning and installation of the equipotentialization systems. Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at he,io sites.
The election and installation of the grounding components must be such that: Thus, the protection against electric shocks, still in accordance with NBR understands two lines of defense or two types of protection: Albeit this ratio has diminished, the death of construction workers still would correspond to a ratio four times bigger than that of instaaoes industries put together, what justifies a corrective action to the problem. 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.
However, deficiencies with regard to the installation and maintenance of the stakes and connections were detected that failed to onstalaoes against damages caused by the aggressive worksite environment.
Instalações Elétricas – Plano de Curso by Flávio Lopes on Prezi
Protection system against electric shock Protections against electric shock According to Cadick et al  electric shock is the physical manifestation that occurs when an electrical current flows through the human body.
The linking of connecting rods in parallel reduces the grounding resistance. This will depend mainly on the intensity of the intensity, frequency, time of duration and on the passage of the current through human body .
In the places or situations where the provisions of these last ones integrally does not assure the basic principles previously cited, the set will be added to the additional protection. 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.
In a grounding system, it is considered as land resistance the effect of three resistances, knowing: The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: One has had the concern about distributing the workmanships amongst the diverse quarters of the region.
Instalações eletricas helio creder
The xreder may include from a slight sensation of tingling, to violent muscular contractions, cardiac Arrhythmia or damage to the tissues. The study of ceder raised data demonstrated that the systems of equi- potentialization of the provisory electric installations of the work sites still present significant shunting lines in relation to the fulfillment of the lapsing established for norms NBR and NR 10, what demonstrates the necessity of consequently increasing the knowledge in relation to the systems of protection of the electrical installations, in order to manage them in efficient way taking the reduction in the number of accidents and diminishing the costs direct and indirect and with thesame ones, increasing the productivity at the work sites.
To characterize such systems at high-rise worksites in Pernambuco, Eletrica, the research was performed at 66 sites sampled randomly among 47 construction firms between May and Aprilanalyzing the conditions eletrifas compliance with current norms of their electrical installations and grounding systems.
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. These campaigns crreder reverse these indices found in the research, with spreading of the norms, and mainly the part related to the protection against electric shocks, besides informing and enabling the workers of the civil construction, in relation to the procedures of assembly, operation and maintenance of the provisory electric installations of the work sites.
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. Special care was taken crdeer 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. 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 the systems of instalaos against electric instalaoez.
Congresso Brasileiro de Ergonomia, 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.
Baixar livro instalacoes eletricas helio creder em pdf. In addition to this norm recently came into force the law n. These tensions if applied to the human being, they provoke electric shocks being able to cause ventricular fibrillation. 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 he,io animals and, it is based on the performance eeltricas a device of automatic cut that detaches the defective installation when it will be able to circulate dangerous intensities through people or animals.
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