To what maximum percentage can splices and taps fill a surface nonmetallic raceway?

The maximum percentage that splices and taps can fill a surface nonmetallic raceway is designated as 60 percent according to the National Electrical Code (NEC). This guideline is established to ensure that there is sufficient room within the raceway for heat dissipation and to allow for potential future additions of conductors without violating space requirements.

This percentage is crucial for maintaining safety and performance standards in electrical installations. Proper fill prevents overheating and ensures that all conductors can operate effectively without risk of damage due to overcrowding.

The other options indicate higher percentages, which do not align with the NEC requirements for raceway fill, emphasizing the importance of adhering to the established standards for electrical systems. Understanding these specifications is key for ensuring compliance and the safe operation of electrical installations.