18 dez. Instalações Elétricas 15ª Ed. Taiane Alves · Instalações Elétricas Industriais – João Mamede Filho 6ª Ed. Anderson Silva · Instalações eletricas. Livro Helio Creder em pdf #!pIY0HKgD! 5C2nnR2k7H0EPdgOLoG1nBxhLUqWPmenKdTYcNvNRTA. Helio creder instalações eletricas is on Facebook. To connect with Helio creder instalações eletricas, join Facebook today. Join. or. Log In. Helio creder.
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Instalacoes eletricas prediais instalacoes eletricas prediai.
The study of the 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 instalakes and indirect and with thesame ones, increasing the productivity at the work sites.
It is common to use the removal between connecting rods eletrcias or superior to the length of the 8 connecting rod [ 8 ]. The majority of the visited workmanships eletricad found in the phase of structure and finishing, as it shows Table 1, as the provisory electric installations are installed in the beginning of elettricas 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.
However, deficiencies with regard to the installation and maintenance of the stakes and connections were detected that failed to protect against damages caused by the aggressive worksite environment. Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms. 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 protection against electric shocks.
Field research Table 2 — Grounding of gears, Length of the grounding electrode and grounding resistance. Soon, a grounding system aims at: These non-controlled risks can cause accidents which vary from superficial injuries to fatal accidents.
In view of the described aspects above the objective of this research is tocharacterize 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.
Livro helio creder instalações eletricas pdf
This will depend mainly on the intensity of the intensity, frequency, time of duration and on the passage of the current through human body . The Brazilian norms predict specific protection systems to electricalinstallations, on what refers to the safety of the worker one can quote the Regulatory Norm n.
The analysis of the data was made using the Microsoft Excel and a data base developed for such in the Microsoft Access. 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. It must therefore be evidenced, as much for the public in general, as for the entrepreneurs of the industry of the civil construction, the importance of the use, adequate sizing and installation of the equi-potentialization systems so that they guarantee its effectiveness in the prevention of when requested the electric shocks.
According to Cadick et al  electric shock is the physical manifestation that occurs when an electrical current flows through the human body. One has had the concern about distributing the workmanships amongst the diverse quarters of the region. However, in practice it is not common to use very long connecting rods, which are not simple to embed in the ground. 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.
Gelio collection of data in the work sites was carried through between May of the April of In a grounding system, it is considered as land resistance the effect of three resistances, knowing: The touch tension is the existing electric tension between the superior and inferior limbs of an individual, due to an imperfection in the equipment, while the step tension can be understood in the following way, considering an electrode of vertical grounding nailed into a homogeneous land, and its area of radial dispersion of until a meter one has creeder limited parcel of tension which a close person can be submitted to a tension called step.
The accidents risks involving electrical energy become preoccupying due toits seriousness.
For identification of the electric risks at the work sites, a specific protocol, based in previous studies was elaborated and the current law NR 10, NR 18 and NBR Rio de Janeiro, The chain that enters the grounding system is dispersed in the ground,generating electric tensions. In this context it is basic the concept of touch tension and tension of step.
The bigger the length of the rod the less resistance cerder grounding, this because the bigger the connecting rod the bigger the surface the current passage, thus diminishing the resistance.
Instalações elétricas – Helio Creder – Google Books
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. In the year ceeder one would find registered in this sector of civil construction, 1, employees in all Brazilian territory, being Instalacoes eletricas helio creder estante virtual.
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The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: The step tension can provoke serious damages to a person due to the current levels and tension that can be attained . 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.
Instalacoes eletricas instalacoes eletricas 14 edicao helio creder. 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 eletrifas 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. Therefore, for understanding the steps and safe procedures needed to the use of energy and the handling of electrical nistalaoes requires the comprehension of electrical risks .
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. Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at work sites.
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: This proves that it is necessary to invest more in education and awareness for civil construction workers and management, not only about the equipment they must acquire, but on the manner in which it must be installed, documented and utilized.
The most used are of 2 and 3 m. 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. 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. The linking of connecting rods in parallel reduces the grounding resistance.
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As mais variadas edicoes, novas, seminovas e usadas pelo melhor preco. Livro instalacoes eletricas helio creder em pdf livros no. 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.
Albeit this ratio has diminished, the death of construction workers still would correspond to a ratio four times bigger than that of all industries put together, what justifies a corrective action to the problem.