No conductor larger than that for which the raceway is designed is permitted to be installed in what type of raceway?

In the context of raceway systems, which provide a pathway for electrical conductors, specific regulations are in place to ensure safety and functionality. Surface metal raceways, designed to protect and organize electrical conductors on the surface of walls or ceilings, have their own sizing criteria based on the maximum conductor size they can accommodate.

In this case, the importance of adhering to the manufacturer's design specifications is crucial. Installing a conductor larger than the design allows can present significant hazards, including overheating, physical damage to the raceway, and potentially leading to electrical faults or fire hazards. The restrictions are in place to ensure that the conductors can adequately fit within the raceway without compromising safety and performance.

In contrast, the other types of raceways mentioned have different designations or tolerances that may allow for larger conductors under specified conditions. Therefore, the correct understanding of the type of raceway in question is essential for ensuring compliance with electrical standards and maintaining safe installation practices.