What is the main factors which governs the size and rating of electrical machines? All Questions › Category: Electrical Machines › What is the main factors which governs the size and rating of electrical machines? 0 Vote Up Vote Down Akash Tiwari asked 4 years ago 1 Answers 0 Vote Up Vote Down Akash Tiwari answered 4 years ago “Temperature rise” is the main factors which governs the size amd rating of electrical machines.