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.
Inside the world's deepest blue hole. Plummeting to depths of 300m (987ft), researchers say this sinkhole in the South China Sea is the deepest in the world. See More. Plummeting to depths of 300m (987ft), researchers say this sinkhole in the South China Sea is the deepest in the world. U.S. Edition.