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Fixture wires are permitted for installation when they are enclosed or protected and not subject to bending or twisting. This scenario is crucial because fixture wires are designed for specific applications where they won't experience mechanical stress or exposure to environmental elements that could compromise their safety and functionality.

In environments that expose wires to potential physical damage, moisture, or extreme temperatures, the risk of insulation breakdown, shorts, or electrical fires is significantly increased. By ensuring that the wires are enclosed or protected, their integrity is maintained, making them suitable for safe installation within fixed fixtures, such as lighting and other electrical fixtures. This compliance with safety standards is essential to prevent hazards and ensure longevity in electrical circuits.

Other scenarios, like exposed outdoor areas or open wiring systems, could lead to significant risks that the design of fixture wires does not accommodate. These environments expose wiring to elements and potential physical damage, making them unsuitable for installation with fixture wires. Temporary installations typically have different requirements and standards, as they may not be meant to endure the same conditions over time.