ground resistance testing in the mining industry

Over the past decade (1963 – 1973), there has been a change of emphasis in the field of rock mechanics from a purely theoretical approach to the practical solution of problems which occur in the mining industry. Soil resistivity testing, geological surveys, and test borings provide the basis for all grounding design. Robert L. Cascio. Your electrical system needs a low impedance path to ground for protecting people and equipment.

Mobile equipment operating at more than 300 volts shall have ground fault protection and ground conductor monitoring. The responsibilities of the rock mechanics engineer in the mining industry, and the available computer programs and their applications. Such deterioration is unavoidable, as it is the result of the ion exchanges that make grounding systems effective in the first place. International Electrical Testing Association. Grounding in the Mining Industry. When mobile equipment is connected to the distribution system the grounding equipment and the ground fault protection should be designed to comply with CSAStd. To help ensure a reliable connection to earth, electrical codes, engineering standards, and local standards often specify a minimum resistance for the ground electrodes. Here you can find a geophysical consultant .. Presented at the Annual Technical Conference of the. Jones Instruments has a wide assortment of geophysical equipment to rent. Here’s why grounding is important in the mining industry and some different methods of system grounding that keep workers protected. Ground resistance testers are used to check the electrical integrity an instrument. GROUND RESISTANCE TESTING IN THE MINING INDUSTRY. and.

Federal regulations require the safety ground bed resistance to be measured once a year or after modifications for the Metal/Nonmetal Mining Industry. A resistivity test or an earth resistivity survey is used for measuring soil ground resistance or earth resistivity imaging. Coal mine regulations require connection to a low resistance ground medium. March 19, 1987. TESTING OF EARTHS GROUND RESISTANCE Through research conducted by the Bureau of Mines, the most reliable and accurate methods of measuring earth ground resistance is the fall of potential method. This method of measurement is detailed in the Bureau of Mines Publications IC 8835, Guide to Substation Grounding and Bonding for Mine Power Systems. U.S. Department of Labor. Proper soil resistivity testing using the Wenner 4-point method is recommended because of its accuracy. The interNational Electrical Testing Association (NETA) specification Maintenance Testing Specifications for Electrical Power Distribution Equipment and Systems provides much more realistic and useful values. Because grounding systems deteriorate and so does their performance. By ensuring this, all separate pieces of equipment will raise to the same potential during a surge condition.” In addition to earth resistivity meters and soil ground resistance instruments, K.D. A ground resistance measurement can be accepted as evidence of compliance with these regulations. Since the 1970s, grounded systems have been implemented across the mining industry to … Also, "acceptable" values of insulation resistance depend upon the equipment you're testing. Given the myriad of requirements, it stands to reason that earth testing is an extremely important practice for mining companies. NEMA also makes the point that “More important than the absolute value of the ground resistance, is to ensure that all the equipment in the facility is referenced to an equi-potential ground plane through adequate bonding. The purpose of the earth grounding is to enable a safe path for the lightning strikes, RFI and EMI signals, dissipation of fault currents, interference and static discharges. William J. Helfrich. Since the 1970s, grounded systems have been implemented across the mining industry to protect workers from shock hazards and lightning. Importance in the Mining and Aggregates Industry: In the mining industry, protection from electrical faults is a key part of mine safety. These incidents are associated with the use of powered equipment in extreme environmental conditions. Ground resistance testers can be used to take many other measurements including, ground bond, Earth leakage, etc. Additional data is always helpful and can be collected from existing ground systems located at the site. M421-00 Use of Electricity in Mines, which requires that:. Historically, many field electricians use the somewhat arbitrary standard of 1 megohm per kV. Mine Safety and Health Administration.


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