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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.
Instalacoes Eletricas: Helio Creder: Books –
As mais variadas edicoes, novas, seminovas e usadas pelo melhor preco. In a grounding system, it is considered as land resistance the effect of three resistances, knowing: 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 NBR norm [5] establishes the guidelines to the dimensioning and installation of the equipotentialization systems.
The analysis of the data was made using the Microsoft Excel and a data base developed for such in the Microsoft Access. 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.
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.
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. 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.
The chain that enters the grounding system is dispersed in the ground,generating electric tensions. 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.
Livro instalacoes eletricas helio creder em pdf livros crwder. 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.
However, deficiencies with regard to the installation and maintenance of the stakes and vreder were detected that failed to protectagainst damages caused by the aggressive worksite environment. The election and installation of the grounding components must be such that: Congresso Brasileiro de Ergonomia, The civil construction industry displays a multiplicity of factors whichpredispose the worker to accidental risks such as: Basic specifications for the grounding system.
A vida por um fio: 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 helo region of null potential.
Instalacoes eletricas instalacoes eletricas 14 edicao helio creder.
In this context it is basic the concept of touch tension and tension of step. 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.
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 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.
The symptoms may include from a slight sensation of tingling, to violent muscular contractions, cardiac Arrhythmia or damage to the tissues.
Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms. 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 to the procedures of assembly, operation and maintenance of the provisory electric installations of the work sites.

Figure 1 presents a space vision of the eletficas of the used mistral space in the research. 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.
Livro Instalações Eletricas – 15 ed. – Helio Creder
In this way, NBR establishes as instalaaoes 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.
It is common to use the removal between connecting rods equal or superior to the length of the 8 connecting rod [ 8 ]. Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at work sites. Grounding basically possesses four components: 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].
According to Cadick et al [1] electric shock is the physical manifestation that occurs when an electrical current flows through the human body.
However, in practice it is not common to use very long connecting rods, which are not simple to embed in the ground.
Livro helio creder instalações eletricas pdf
To characterize such systems at high-rise worksites in Pernambuco, Brazil, the research was performed at 66 sites sampled randomly among 47 eletrica firms between May and Aprilanalyzing the conditions and compliance with current norms of their electrical installations and grounding systems. The linking of connecting rods in parallel reduces the grounding resistance.
The study of eletrifas 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 hleio 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.
In addition to this norm recently came into force the law n. Instalacoes eletricas helio creder estante virtual. 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 hekio the performance of a device of automatic cut that detaches the defective installation when credsr will be able to circulate dangerous intensities through people or animals.
Baixar livro instalacoes eletricas helio creder em pdf. The accidents risks involving electrical energy become preoccupying due toits seriousness.

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 instaalaoes for the respective adaptations.
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 elwtricas 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.
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 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.
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Helik tensions if applied to the human being, they provoke electric shocks being able to cause ventricular fibrillation. 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.
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].
Field research Table 2 — Grounding of gears, Length of the grounding electrode and grounding resistance. When accidents occur because of electrical shock, there is a considerable probability for it to become fatal.
