What should be done before working on blown fuses?

Before working on blown fuses, it is crucial to verify that the circuit is disconnected. This step ensures that no electrical current is present while performing maintenance or replacing the fuses, significantly reducing the risk of electric shock or injury. A disconnected circuit means that workers can safely handle the blown fuses and any associated electrical components without the risk of accidental energization.

While checking for visible damage, testing the ground connection, and measuring the fuse voltage are important procedures in general electrical safety and maintenance, they do not replace the fundamental necessity of ensuring that the circuit is de-energized before any physical work is performed. Ensuring disconnection is the first line of defense in maintaining safety when dealing with electrical components.