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20 amp vs. 15 amp Plugs & Wall Outlets

When selecting electrical plugs and outlets for your home or business, understanding the differences between 15 amp and 20 amp configurations is crucial to ensure safety and efficiency. Below is a comparison of the two types commonly used in the U.S.

 

20 Amp Plug and Wall Outlet:

  • Amperage Capacity: A 20 amp outlet can handle up to 20 amps of current, providing more power than a 15 amp outlet.
  • Design: The outlet has a T-shaped slot on one side in addition to the standard vertical slot and ground pin, which accommodates a 20 amp plug.
  • Wire Gauge: Typically wired with 12-gauge wire, which can handle higher electrical loads.
  • Compatibility: A 20 amp plug has a perpendicular prong and can only fit into a 20 amp outlet, ensuring that high-power devices are connected safely.
  • Applications: Ideal for heavy-duty appliances like air conditioners, refrigerators, or power tools.

15 Amp Plug and Wall Outlet:

  • Amperage Capacity: A 15 amp outlet is designed to handle up to 15 amps of current.
  • Design: The outlet features two vertical slots and a ground pin. It is the most common household outlet and supports devices like lamps, televisions, and small appliances.
  • Wire Gauge: Typically wired with 14-gauge wire.
  • Compatibility: A 15 amp plug fits into a 15 amp outlet or a 20 amp outlet, allowing for flexibility in standard applications.
  • Applications: Best suited for lower power devices such as fans, computers, and lighting.

Key Takeaway:

  • 15 amp outlets are perfect for everyday household electronics, while 20 amp outlets are necessary for more demanding appliances. Be sure to install the correct outlet based on the electrical load to avoid potential overloads or fire hazards.


Upgrading a 15 amp wall outlet to a 20 amp wall outlet is typically a very minimal cost. However, the costs may vary depending on your current electrical wiring and building age. Always consult a licensed electrician for guidance on proper installation and load requirements.