Each distribution transformer has its own fuse sized based on its maximum current. In Canada say you have a 75 kva transformer (about as big as theyll use on a pole) with lets say 7500v on the primary (power line) feeding 240v split phase secondary which is center tapped so you get 2 lines at 120v and one neutral that is system grounded at the pole. A 75 kva transformer could easily supply up to 3 homes each having 200A services. 75 000 va (volt amps , similar to watts but other factors involved) divided by 7500v is only 10A. That fuse would be 10x 1.25 so itd most likely be 15A fuse on the primary. BUT for a fault on the secondary to create over 15A on the primary is a whole nother deal. On the secondary side you again take 75 000 va this time divide by 240v and you get 312.5 A , to create a 15A current on that primary itd take 390A fault on the secondary. BIG boom!
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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