Final answer:
A qualified electrical worker must be able to determine the nominal voltage of exposed live parts in order to ensure safety and proper operation.
Step-by-step explanation:
Electrical Engineering: Qualified Electrical Workers
A qualified electrical worker must be able to determine the nominal voltage of exposed live parts.
In electrical engineering, it is crucial to understand the voltage levels of live parts to ensure safety and proper operation. This knowledge helps in assessing the risks associated with electrical systems and implementing the necessary precautions to prevent shocks and hazards.
For example, in the context of electrical safety systems, the three-wire system is used to guard against thermal and shock hazards. It utilizes live/hot, neutral, and earth/ground wires, and grounds the neutral wire and case of the appliance to prevent electrical contact and minimize voltage differences.