Any electrical appliance may break.If it just stopped working - it's not so bad.Worse, if the failure results in the penetration of electric voltage on the elements of its design that the user feels safe.Inadvertently touching this subject, the person subjected to an electric shock may be injured or worse ...
What is the protective earth
For internal breakage of the conductor becomes possible to touch the body of the electrical or other device, in which case the latter will be a mortaldanger, invisible, and therefore doubly terrible.To avoid such situations, apply grounding devices.Mounted they are very simple, but absolutely must meet several requirements.
Exterior equipment, and any equipment present in wet areas must be grounded and neutral earthing, if the supply voltage exceeds 42 V AC or 110 V DC.The same applies to all the live elements of metal power tools, baskets, shields and designs where the cable.
What is grounding
Grounding device consists of two main parts.
The first of these is called grounding, and often is a natural building block, such as valves, buried pipelines and other details to ensure a reliable and repeated contact with the ground.If due to some circumstances, such structures are not available or are not available, use artificial grounding devices.They are steel angles, buried in the ground to a depth of at least 60 cm from the face size of 5 cm and a thickness of not less than 4 mm.The length of each of these elements must be at least 3 meters, they are deep into the ground, then welded thereto steel strip, which fastening is carried out conductors that is the second part of the structure of the electrical safety.
Grounding requirements
grounding resistance should be minimal, so the requirements for contact reliability is very high.Its main purpose is to create conditions for a power outage in the event of contact with live parts with the elements that are not normally need to be energized.On how quickly happen EPO often depends on human life.
Monitor the ground
In order to control the degree of Electrical, made periodic measurement of grounding devices.The physical significance of this procedure is to determine the actual resistance for which emergency will pass current.For this purpose, special instruments, probes and manned control is a precision ohm meters (eg, MRU-101).
The enterprises are responsible for the electrical specific officials, this is usually the chief power engineer, chief of occupational safety and, of course, management.The private apartment, country house or private structure grounding devices controlled by the owners of the property.
Be careful and cautious!
