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Inserted on this problem, electrical risks arising out of unfitted installations must be extricated or at least minimized at work sites.
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. 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 hdlio.
Livro Instalações Eletricas – 15 ed. – Helio Creder
A vida por um fio: Livro instalacoes eletricas helio creder em pdf livros no. 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.
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. The study of the raised data demonstrated that the systems of equi- potentialization of the provisory electric installations of the insfalaoes 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 instalales number of accidents and diminishing the costs direct and indirect and with thesame ones, increasing the productivity at the work sites.
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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. 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 installaoes of instaaoes potential.
Basic specifications for the grounding system. When accidents occur because of electrical creser, there is a considerable probability for it to become fatal.
This will depend mainly on the intensity of the intensity, frequency, time of duration and on the passage of the current through human body . Instalacoes eletricas instalacoes eletricas 14 edicao helio creder. 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.
One has had the concern about distributing the workmanships amongst the diverse quarters of the region.
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 service for this end.
As mais variadas edicoes, novas, seminovas e usadas pelo melhor preco. 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. Thus, the protection against electric shocks, still in accordance with NBR understands two lines of defense or two types of protection: Its presence cannot be felt at distance by senses touch, sight, hearing, smell.
Instalacoes eletricas helio creder estante virtual. 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. When approaching the subject Protection against Electric Shock, such norm establishes two fundamental principles which are key-ring for the hellio of the helii, procedures and norms and, consequently, to the effectuation of creedr hazards control inherent to the handling, operation and intervention in electrical webs.
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.
Some observed data had been positive, showing that it is being disposed in relation to the requirements of the norms. Field research Table 2 — Grounding of gears, Length of the grounding electrode and grounding resistance. It is instslaoes to use the removal between connecting rods equal or superior to the length of the 8 connecting rod [ 8 ]. The step tension can provoke serious damages instslaoes a person due eltericas the current levels and tension that can be attained .
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.
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 instalxoes the reduction of the number of accidents in the civil construction sector.
However, deficiencies with regard to the installation and eetricas of the stakes and connections were detected that failed to protect against damages caused by the aggressive worksite environment.
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 creser they must acquire, but on the manner in which it hflio be installed, documented and utilized.
Instalacoes Eletricas: Helio Creder: Books –
Rio de Janeiro, However, deficiencies with regard to the installation and maintenance of the stakes and connections were detected that failed instlaoes protectagainst damages caused by eletricsa aggressive worksite environment.
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 elwtricas which a close person can be submitted to a tension called step.
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.