Final answer:
In case of a blown fuse involving high-voltage wiring, an electrician should be contacted due to their expertise in handling electrical systems safely. It's advised to keep one hand in your pocket when working with high-power circuits to avoid electric shock through the heart. Larger circuit breakers often employ insulating gas to manage high-voltage current interruptions and sparks.
Step-by-step explanation:
If a fuse blows and you suspect there is a problem with high-voltage wiring, you should contact an electrician immediately. Electricians are trained professionals who understand how to safely handle and repair electrical systems. Dealing with high-voltage circuits can be extremely hazardous, and requires specialized expertise that electricians possess.
Working with high-power electric circuits can be dangerous, so it is recommended to work "one-handed" or to "keep one hand in your pocket" to minimize the risk of electric current passing through the heart, which could be fatal. This is a sensible suggestion because it helps to avoid creating a path for the electrical current to travel through the body.
Fuses and circuit breakers are designed to protect electrical circuits by interrupting the flow of excessive current. However, they are not always capable of preventing sparks when interrupting high-voltage currents, which is why larger circuit breakers in power-distribution systems may use insulating gas and gas jets. This is also a reason why AC power is generally safer in such circumstances, as it cycles through zero volts, providing an opportunity to extinguish arcs that may form.