Indoor-rated electrical hardware can be installed outdoors if it is housed in a NEMA-rated enclosure.

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A NEMA-rated enclosure provides the outdoor protection that indoor equipment lacks. When you place indoor-rated hardware inside an enclosure that is specifically rated for outdoor service, the enclosure becomes the environmental barrier, shielding the equipment from rain, dust, corrosion, and other outdoor hazards. The key is choosing an enclosure rating that matches the environment you’re in (for example, 3R for general outdoor weather, 4X for wet or corrosive settings, and so on) and ensuring all penetrations are properly sealed and the installation remains within the enclosure’s listed limits. With the right outdoor-rated enclosure, indoor equipment can operate outdoors safely.