If overvoltages (short-duration rises of voltage) can occur in an installation, the design and dimensions of the electrical insulation are also determined by the magnitude of possible over-voltages and by the short-term electrical strength.
Ray, North Dakota. Ray is a city in Williams County, North Dakota, United States. The population was 592 at the 2010 census.
Northwood is a city in Grand Forks County, North Dakota in the United States. It is part of the Grand Forks, ND-MN Metropolitan Statistical Area or Greater Grand Forks. The population was 945 at the 2010 census. Northwood was founded in 1884. A tornado, rated EF4 on the Enhanced Fujita Scale, struck Northwood on the evening of August 26, 2007 causing destruction to the entire town and killing one person.