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The Ufer ground is an electrical earth grounding method developed during World War II. It uses a concrete-encased electrode to improve grounding in dry areas. It uses a concrete-encased electrode to improve grounding in dry areas.
The electrodes for electrical grounding are often called ground rods and are often made from steel with a copper clad surface – typically 1 to 2 m long and 20 millimetres (0.79 in) in diameter. These are driven vertically into the ground and bonded together with bare copper wire . [ 1 ]
A ground fault protection relay must trip the breaker to protect the circuit before overheating of the resistor occurs. High-resistance grounding (HRG) systems use an NGR to limit the fault current to 25 A or less. They have a continuous rating, and are designed to operate with a single-ground fault.
In northern Peru, the World Bank's business-lending arm is part owner of the Yanacocha gold mine, accused by impoverished farming communities of despoiling their land in pursuit of the precious ore. The bank and IFC have stepped up investments in projects deemed to have a high risk of serious and environment damage, including oil pipelines, mines and even coal-fired power plants, an ...
When ground soil has poor conductivity, is very shallow, or non-existent, a grounding system can be augmented by adding ground rods, counterpoise (ground ring) conductor, cable radials projecting away from the building, or a concrete building's reinforcing bars can be used for a ground conductor (Ufer ground). These additions, while still not ...
WASHINGTON (Reuters) -U.S. President Donald Trump is considering merging the U.S. Agency for International Development with the State Department to boost its efficiency and ensure its spending is ...
A 68-year-old woman who police say was killed by her husband in an apparent murder-suicide is being mourned by her community for her generosity and kindness.
Stephen Glosser pleaded guilty to bombing a woman's home and conspiring to "release a large python into the victim's home to eat the victim's daughter," prosecutors say.