Protection when touching the parts no current-carrying Electra installations, protective earth and vanishing.
As mentioned, the metal casings of electrical installations, the so-called no current-carrying parts may be accidentally energized. To protect people when you touch the electrical parts are no current-carrying protective earth and vanishing.
Protective grounding is the intentional electrical connection to ground or equivalent metal parts no current-carrying that may be under stress.
Protective earthling is to be distinguished from the worker, measuring ground and ground lightning. For some units may be wired a building worker protection grounding device. |
Subject to protective earth metal casings of machinery, equipment, vehicles, power tools, frameworks panels, consoles and cabinets, metallic housing cables, steel tubes electrical wiring.
The aim is to reduce the protective ground voltage between the housing and land to a safe value, i.e. a decrease in contact voltage and, consequently, the current flowing through the human body.
With the closure phase of the housing in the absence of a protective earth through a person standing on the ground, currents can flow, life-threatening.
The electric potential of the earth increases - potential difference between the body and earth appear, therefore, the voltage contact and the current through the human body.
Grounding can and artificial. As a natural can be used conductive parts, buried in the ground water - and other cable sheathing. |