Final answer:
The types of circuits used to ensure safety in electrical systems, not specifically in blasting operations, include circuit breakers or fuses, the three-wire system, and Ground Fault Circuit Interrupters (GFCIs), which protect against thermal and shock hazards.
Step-by-step explanation:
The question pertains to types of circuits used in blasting operations, which typically involve the creation and interruption of electrical paths to prevent hazards in electrical systems. Although the question may seem to be related to blasting, the information provided mainly addresses electrical safety in household and industrial contexts. The three types of safety features in circuits that prevent hazards are:
- The circuit breaker or fuse, which interrupts excessive currents to prevent thermal hazards.
- The three-wire system, which includes live/hot, neutral, and earth/ground wires, with the neutral wire and the case of the appliance being grounded to guard against thermal and shock hazards.
- The Ground Fault Circuit Interrupter (GFCI), which prevents shock by detecting the loss of current to unintentional paths.
It should be noted that these safety features use induction to perform their basic function and are essential in modern electricity distribution to provide protection against electrical shocks and fires.