For dry-type transformers having a 220 [degrees] C insulating system and a winding hot-spot temperature of 220 [degrees] C, and with no unusual operating conditions present, the 20-yr life expectancy is a reasonable time frame.he 80 [degrees] C transformer requires operation at 75% or more of full load for a 2-yr payback, and at 100% load to payback in 1 yr over the 150 [degrees] C transformer.
Exposure to arsenic through drinking water is a great threat to human health. Arsenic is a carcinogen and its consumption can negatively affect the gastrointestinal tract and cardiac, vascular and central nervous systems.
These forms can be very poisonous, even in small doses. Donât take arsenic supplements. Taking 10 mcg/kg/day over a period of time can produce symptoms of arsenic poisoning. Taking 5 mg of arsenic, or sometimes less, can cause digestive tract symptoms. Higher doses can cause severe poisoning and death. Inorganic arsenic is classified as a human cancer-causing agent. Laws have been made to regulate the amount of arsenic that is allowed in the water supply. The maximum permissible level of arsenic in drinking water is 10 mcg/L.