A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when the current to ground exceeds the values established for a Class A device, is a(n) "."

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b. s. and b. s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.