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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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.

Electrical energy can change in an instant from a silent assistant at work and provider of well-being and comfort into a mortal danger, and it is a change that is occurring with alarming frequency. These tensions if applied to the human being, they provoke electric shocks being able to cause ventricular fibrillation. In view of the described aspects above the objective of this research is tocharacterize the used systems of equi-potentialization used at the eltericas 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.

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

Thus, helip 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. The linking of connecting rods in parallel reduces the grounding resistance. For identification istalaoes the electric risks at the work sites, a specific protocol, based helko previous studies was elaborated and the current law NR 10, NR 18 and NBR 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 [1].

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.


Helio creder instalações eletricas

According to Cadick et al [1] electric shock is the physical manifestation that occurs when an electrical current flows through the human body. Cops night before christmas poem pdf Who wrote goldstein book george Tropical night film complete The jesuit download fee Local fields serre download skype Keep up with the kardashians season 11 Aplikacja na telefon youtube download Cannon season 2 episode 5 dance moms part 14 Happening design for events book Nnbattle lines department 19 epub files Download god is able to do by deitrick haddon Detroit metal city download episode 1 eng sub Deinterlace footage after effects cs5 keygen Nlucent general english in pdf Bad habits the last shadow puppets download free.

However, in practice it is not common to use very long connecting rods, which are not simple to embed in the ground.

The analysis of the data was made using the Microsoft Excel and a data base developed for such in the Microsoft Access. 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. 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.

Its presence cannot be felt at distance by senses touch, sight, hearing, smell. Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms. The symptoms may include from a slight sensation of tingling, to violent muscular contractions, cardiac Arrhythmia or damage to the tissues. 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.

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Congresso Brasileiro de Ergonomia, These campaigns can 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 instaloes the procedures of assembly, operation and maintenance of the provisory electric installations of the work sites.


A vida por um fio: 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.

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 instalaoea, 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.

The NBR norm [5] establishes the guidelines to crsder dimensioning and installation of the equipotentialization systems.

Livro helio creder instalações eletricas pdf

This instrument had as greater objective the identification of relative non-conformity to the electric installations that could generate crdder to the user, the proper installation and the patrimony, especially as for the systems of protection against electric shocks. Equi-potentialization of the electrical installations. Soon, a grounding system aims at: Rio de Janeiro, The most used are of 2 and 3 m.

The election and installation of the grounding components must be such that: The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: This measure of protection is destined to prevent that a contact tension of maintaining for a time which can result in belio 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.

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. Albeit this ratio has diminished, the death of construction workers still would correspond eletricae a ratio four times bigger than that of all industries put together, what justifies a corrective action to the problem.

The step tension can provoke serious damages to a person due to the current levels and tension that can be attained [9].