Are surge-protective devices (SPDs) permitted to be located outdoors?

Surge-protective devices (SPDs) can indeed be located outdoors, but this is contingent upon them being properly listed for such use. Devices designed for outdoor installation are constructed to withstand environmental conditions, including moisture, temperature extremes, and UV exposure, ensuring their effectiveness and safety.

In practice, it's essential for any outdoor SPD to comply with relevant standards and certifications that confirm its suitability for external applications. While it's possible for SPDs to be installed outdoors when they are specifically rated for that purpose, simply stating that they can be positioned outdoors isn't comprehensive, especially considering the critical aspects of safety and reliability under varying weather conditions.

Thus, while the statement "yes" may seem accurate under certain assumptions, it lacks the necessary specificity about the requirement for listing for outdoor use, which is crucial for ensuring that they operate safely and effectively in an outdoor environment.