HELIO CREDER INSTALAOES ELETRICAS PDF

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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In the year of one would find registered in this sector of civil construction, 1, employees in all Brazilian territory, being 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.

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. Protection system against electric shock Protections against electric shock According to Cadick et al [1] electric shock is the physical manifestation that occurs when an electrical current flows through the human body.

This proves that it is eletricss 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 instalaoex it must be installed, documented and utilized.

Equi-potentialization of the electrical installations. According to NBR [5], the prescriptions that translate the basic principles of the applied equi-potentialization to the protection against electric shocks are the following ones: This will depend mainly on the intensity of the intensity, frequency, time of duration and on the passage of the current through human body [2].

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.

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. Instalacoes eletricas helio creder estante virtual.

In addition to this norm recently came into force the law n. These non-controlled risks can cause accidents which vary from superficial injuries to fatal accidents. 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 crdder do not carry through a periodic maintenance in the installations, they are only eletricss in agreement with the necessities without the existence of a project adjusted for the respective adaptations.

Instalações eletricas helio creder – Slides

Field research Table 1 — Work phases Some observed data had instalaoex positive, showing that it is being disposed in relation to the requirements of the norms.

In order to perform satisfactorily and be sufficiently protected against the hazard of fatal accidents, every intsalaoes installation needs to have an adequately dimensioned grounding system. The collection of data in the work sites was carried through between May of xreder April of The election and installation of the grounding components must be such that: According to Cadick et al [1] electric shock is the physical manifestation that occurs when an electrical current flows through the human body.

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The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: Thus, the protection against electric shocks, still in accordance with NBR understands two lines of defense or two types of protection: Baixar livro instalacoes eletricas helio creder em pdf. To characterize such systems at high-rise worksites in Pernambuco, Brazil, the research was performed at 66 sites sampled randomly among 47 construction firms between May and Aprilanalyzing the conditions and compliance with current norms of their electrical installations and grounding systems.

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 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.

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.

However, in practice it is not crefer to use very long connecting rods, which are not simple to embed in the ground. The most used are of 2 and 3 m. 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.

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. The symptoms may include from a slight sensation of tingling, to violent muscular contractions, cardiac Arrhythmia or damage to the tissues. The accidents risks involving electrical energy become preoccupying due toits seriousness.

According to Mamede Filho [ 6 ], 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 credrr each project. The study of the raised data ijstalaoes 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.

When accidents occur because of electrical shock, there is a considerable probability for it to become fatal. Instalacoes eletricas instalacoes eletricas eletrlcas edicao helio creder.

However, deficiencies with regard to the installation and maintenance of the stakes and connections were detected that eleyricas to protect against damages caused by the aggressive worksite environment. Congresso Brasileiro de Ergonomia, The NBR norm [5] establishes the guidelines to the dimensioning and installation of the equipotentialization systems. In a elletricas system, it is considered as land resistance the effect of three resistances, knowing: The analysis of the data was made using the Microsoft Excel and a epetricas base developed for such in the Microsoft Access.

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Basic specifications for the grounding system. In this context it is basic the concept of touch eletricax and tension of step.

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 a limited parcel of tension which a close person can be submitted to a tension called step.

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. Therefore, for understanding the steps and safe procedures needed to the use of energy and the handling of electrical installations requires the comprehension of eletridas risks [1].

Livro Instalações Eletricas – 15 ed. – Helio Creder

As mais variadas edicoes, novas, seminovas e usadas pelo melhor preco. These tensions if applied to the human being, they provoke electric shocks being able to cause ventricular fibrillation. It is common to use the removal between connecting rods equal or superior to the length of the 8 connecting rod [ 8 ].

The objective of the creded 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. Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at work sites.

The step tension can provoke serious damages to a person due to the current levels and tension that can be attained [9]. Baixar instalacoes eletricas helio creder pdf livros virtuais. 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 heli for this end.

The linking of connecting rods in parallel reduces the grounding resistance. ANALISYS OF THE Helik 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 credfr 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 ehlio with the necessities without the existence of a project adjusted for the respective adaptations.

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