What is the minimum conductor size permitted for the supply conductors of a surge protective device?

The minimum conductor size permitted for the supply conductors of a surge protective device is determined based on safety and performance standards to ensure that the devices operate effectively while maintaining electrical safety. In this context, 14 AWG copper is the accepted conductor size because it provides a balance between sufficient current-carrying capacity and flexibility for installation.

Choosing 14 AWG ensures that the conductors can handle the expected loads without significant voltage drop or overheating, which might occur with smaller conductors. Additionally, 14 AWG copper wire is commonly used in residential and commercial applications, making it a standard choice for various electrical devices, including surge protective devices.

Using a larger wire, such as 10 AWG or 12 AWG, may be acceptable in certain situations but typically exceeds the minimum requirements for most applications involving surge protection. Conversely, smaller wires like 16 AWG would not comply with the minimum standards for safety and performance, potentially leading to issues with the device's functionality and increased risk of electrical faults. Thus, 14 AWG copper emerges as the appropriate choice for the supply conductors of a surge protective device.