Q9Basic Electrical Engineering
Question
2 marks
Q.9 Mention two protective devices in household wiring.
Answer
Two universally utilized protective electrical devices in domestic installations are safety Fuses and Miniature Circuit Breakers (MCB), both explicitly designed to strictly interrupt dangerous fault currents.
Electrical protective devices are rigorously engineered safety mechanisms fundamentally designed to strictly protect physical wiring circuits and appliances from severe thermal damage exactly during overcurrent or short-circuit fault conditions.
- Electrical Fuses: A highly basic, sacrificial thermal device containing a specialized low-melting-point wire that permanently melts and cleanly breaks the circuit when subjected explicitly to excessive current.
- Miniature Circuit Breakers (MCB): An advanced, reusable electromechanical switch that systematically trips and automatically disconnects the electrical supply entirely upon rigorously detecting severe overloads or short circuits. It can be easily physically reset.