Final answer:
Electricians work on finished walls to install outlets or security systems, enhancing the functionality and safety of buildings.
Explanation:
An electrician would work on finished walls primarily to install outlets or security systems. When homes or buildings are already constructed, electricians need to work on finished walls to add new outlets for electrical devices or to install security systems like cameras or alarms. This requires them to carefully cut into the walls and access the wiring without causing damage to the existing structure.
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