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.
Giant Hole Forms In Siberia, And Nobody Can Explain Why. 570. A giant hole has opened up in Siberia, and nobody quite knows why. The massive hole, which spans about 262 feet in diameter, was spotted recently on the Yamal Peninsula in Russia, commonly known as the end of the world, The Siberian Times reported. The depth of the hole is not yet known.