When purchasing US standard plugs (i.e., the internal copper components of power plugs or sockets that conform to US electrical standards), you should focus on safety, compatibility, materials, and certifications.
Confirm the type and polarity of the connector plates.
Polarized connector plates: One large and one small, cannot be inserted in reverse. The positions of the live wire (small plate) and neutral wire (large plate) are fixed, improving electrical safety.
Non-polarized connector plates: Two plates of the same size, can be inserted in both directions, but ensure that the device itself has polarity protection or a switch to control the live wire.
Hole Design: The small holes on the plug are used to engage with the protrusions inside the socket, preventing loosening and enhancing contact stability.
Prioritize products with safety certifications. UL certification (Underwriters Laboratories, USA) or CUL certification (Canada) are basic requirements for US-standard inserts to enter the North American market, representing that they have passed rigorous safety and durability testing. Check whether the product itself or its packaging has a clear UL mark or cUL mark.
