When a raceway is run from the interior to the exterior of a building, what requirement must be met?

When a raceway is run from the interior to the exterior of a building, it must be sealed to prevent moisture, dust, and other environmental factors from entering the raceway. Sealing the raceway helps maintain the integrity of the electrical system, ensuring that it remains safe and effective in providing power and protecting the wiring inside. Proper sealing can also prevent corrosion and potential short circuits caused by foreign substances that could enter the raceway.

Maintaining an effective barrier between the interior and exterior helps comply with safety codes and standards that are designed to protect both the wiring and the overall electrical system from damage. This ensures continued operation and safety in both the indoor and outdoor environments, which is critical for residential wiring applications.