What type of conductor is commonly used for underground service laterals?

What type of conductor is commonly used for underground service laterals?

• A. Aluminum
• B. Non-metallic
• C. TW-rated copper
• D. UF-rated conductors

Answer: (D)

The use of UF-rated conductors for underground service laterals is appropriate because these conductors are specifically designed for direct burial applications. UF (Underground Feeder) cable is constructed to withstand exposure to moisture and provide the necessary insulation to protect against soil acidity and other environmental factors that can deteriorate lesser quality cables. Additionally, UF-rated conductors have a durable outer jacket that helps resist abrasion and impact, which are important considerations in underground installations. This makes them safe and reliable for providing electrical service where the conductors are placed under ground and may be subject to stress from the surrounding soil. In contrast, the other options do not have the same approval or suitability for underground installations. For instance, aluminum conductors, though they can be utilized for some underground applications, typically require special care in handling and installation due to their properties. Non-metallic conductors are too vague and do not point to a specific type of cable designed for underground use. TW-rated copper is also not suitable for direct burial, as it doesn't have the necessary weather and moisture resistance for these applications. Therefore, UF-rated conductors are the most appropriate choice for underground service laterals outlined in the NEC.

The use of UF-rated conductors for underground service laterals is appropriate because these conductors are specifically designed for direct burial applications. UF (Underground Feeder) cable is constructed to withstand exposure to moisture and provide the necessary insulation to protect against soil acidity and other environmental factors that can deteriorate lesser quality cables.

Additionally, UF-rated conductors have a durable outer jacket that helps resist abrasion and impact, which are important considerations in underground installations. This makes them safe and reliable for providing electrical service where the conductors are placed under ground and may be subject to stress from the surrounding soil.

In contrast, the other options do not have the same approval or suitability for underground installations. For instance, aluminum conductors, though they can be utilized for some underground applications, typically require special care in handling and installation due to their properties. Non-metallic conductors are too vague and do not point to a specific type of cable designed for underground use. TW-rated copper is also not suitable for direct burial, as it doesn't have the necessary weather and moisture resistance for these applications. Therefore, UF-rated conductors are the most appropriate choice for underground service laterals outlined in the NEC.