Questions: According to the NEC, must be installed in a raceway system that pas from the interior to the exterior of a building. A) color tagging B) tap conductors C) seals D) S -loops

The answer is C: seals.

Explanation for each option: A) Color tagging - This refers to the practice of marking wires with different colors to identify their purpose, but it is not specifically required by the NEC for raceway systems passing from the interior to the exterior of a building. B) Tap conductors - These are conductors that connect to a main conductor without overcurrent protection at the point of connection, but they are not specifically required by the NEC for raceway systems passing from the interior to the exterior of a building. C) Seals - According to the National Electrical Code (NEC), seals must be installed in raceway systems that pass from the interior to the exterior of a building to prevent the passage of gases, vapors, or flames through the raceway. D) S-loops - These are loops of wire used to provide slack and flexibility, but they are not specifically required by the NEC for raceway systems passing from the interior to the exterior of a building.

Summary: The NEC requires seals to be installed in raceway systems that pass from the interior to the exterior of a building to ensure safety by preventing the passage of gases, vapors, or flames.