Using SPT1 C9 temporary Christmas lighting year-round on buildings poses significant safety and fire hazards, primarily due to the following reasons:
1. Temporary Installation Limitations (NEC Article 590)
  - The NEC specifically outlines that temporary wiring should not be used as a permanent solution. Article 590 of the NEC states that temporary electrical power and lighting installations are permitted for a period of 90 days for holiday decorative lighting.
  - Beyond this period, the temporary wiring must be removed or replaced with a permanent wiring solution that complies with all applicable codes.
2. Durability and Weather Resistance
  - Temporary lighting, such as SPT1 C9 lights, is typically not designed to withstand prolonged exposure to weather conditions. The insulation and materials used in these lights can deteriorate due to UV radiation, rain, snow, and temperature fluctuations.
  - Over time, exposure to these elements can cause the insulation to crack or break, increasing the risk of electrical shorts, which can lead to fires.

3. Intended Use and Warranty Limitations
  - Manufacturers often specify that SPT1 C9 lighting is designed for temporary, seasonal use. They usually provide guidelines that suggest these lights should be used only for a few weeks to a few months at a time.
  - Using the lights beyond the manufacturer's recommended duration can void any warranties and may not be covered under their safety assurances.
4. Material Degradation and Electrical Hazards
  - The materials used in temporary Christmas lights are often not rated for extended use. Over time, the insulation can degrade, increasing the likelihood of exposed wires and short circuits.
  - Prolonged use can also lead to corrosion of electrical connections, creating hot spots that are potential ignition sources.

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