What is the maximum size conductor permitted for devices where the "push-in" method is used?

The maximum size conductor permitted for devices using the "push-in" method is indeed 14 AWG copper (solid). This limitation is primarily due to the design and functionality of push-in connections. These connections are intended for smaller gauge wires, as they can become less reliable when larger conductors are used.

Using a size of 14 AWG ensures that the conductor can be securely inserted into the device without risk of loosening or creating poor electrical contact, which could lead to overheating or failure of the connection. Therefore, adherence to this size limit is crucial for maintaining safety and ensuring that devices operate correctly and efficiently.

Larger gauges, such as 10 AWG or 12 AWG, exceed the manufacturer's specifications for push-in connectors and could compromise performance and safety, while 16 AWG, while being smaller, does not represent the maximum permitted size for this method.