What is used to determine the number and size of conductors used in a raceway?

The determination of the number and size of conductors used in a raceway primarily relies on the raceway size. This is because the internal dimensions of the raceway dictate how many conductors can fit within it without overcrowding, which could lead to overheating and electrical issues. Adhering to the raceway's capacity ensures that conductors are adequately spaced and protected, complying with electrical codes and safety standards.

While power supply, voltage rating, and wire gauge are critical considerations in electrical installations, they are not the primary factors for determining the size and number of conductors specific to raceways. Power supply refers to the source of electricity, voltage ratings indicate the operational levels, and wire gauge (which correlates to conductor size) plays a role in current carrying capacity but does not directly impact how many conductors can safely occupy the raceway. Hence, focusing on the raceway size is essential for ensuring that all conductors can fit safely and effectively.