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 Great Blue Hole of Lighthouse Reef is believed to be Earth's largest in area, but it's not even close to being the deepest. Dean's Blue Hole, near Clarence Town in the Bahamas, drops away into a 663-foot underwater cavern, deep enough to submerge the Washington Monument or Seattle's Space Needle.