What material is commonly used for electric service wire insulation in underground applications?

What material is commonly used for electric service wire insulation in underground applications?

• A. PVC
• B. Rubber
• C. Fiberglass
• D. Silicone

Answer: (A)

PVC, or polyvinyl chloride, is widely used for electric service wire insulation in underground applications due to its excellent resistance to moisture, chemicals, and UV light. This dielectric material is durable, cost-effective, and provides adequate protection against physical damage and environmental factors that can be present in underground installations. It has good electrical insulating properties and is compliant with industry standards for safety and performance in a variety of conditions.

In contrast, while rubber does offer flexibility and some resistance to moisture, it may not be as durable in the long term when exposed to certain environmental factors, especially in underground settings. Fiberglass, although a strong insulating material, is generally not used for cable insulation due to its brittleness and handling challenges. Silicone provides good heat resistance and flexibility but is typically used in specialized applications rather than for general underground wire insulation.