What is the purpose of using aluminum conductors for 20 amp receptacles?

Using aluminum conductors for 20 amp receptacles primarily serves the purpose of cost efficiency. Aluminum is less expensive than copper, which makes it a popular choice in electrical installations when budget constraints are a factor. Additionally, since aluminum has a lower density compared to copper, it can be produced at a lower cost while still meeting the necessary electrical standards for certain applications, including residential wiring.

While weight consideration is relevant—aluminum is lighter than copper—this aspect does not specifically enhance the purpose of conductors used in receptacles. Improved conductivity is typically associated with copper, as it has better conductivity than aluminum. Resistance to corrosion is also a factor, but aluminum requires specific handling and treatment to mitigate oxidation issues, often rendering that aspect less significant than the economic benefits of using aluminum. Thus, the choice of aluminum conductors ultimately aligns with optimizing costs while maintaining functionality in electrical systems.