Another consideration is the relationship. between insulation class, temperature rise, and ambient temperature. The insulation. class rating designates the maximum. operating temperature for a winding. The. temperature rise is the difference between the.
China claims it has discovered the world's largest hole, and it's in one of the most dangerous places on the planet. 1  Jul.  Good news: China claims it has discovered the world's largest hole. On Wednesday, state broadcaster CCTV announced that the newly found dragon's hole, a 984-foot (300-meter) cavern in the disputed waters of the South China Sea, is now the world's largest hole.
The record on Earth is held by a stone found by a mining company in August 2007 in a North West province of South Africa. Before that, the Cullinan, which was found near Pretoria in 1905, was the largest cut diamond in the world at 530.20 carats, until it lost the record in 1985 to the Golden Jubilee.