New York State Master Electrician Practice Exam

What is a key advantage of using multiconductor cable for underground service?

1. Reduced voltage drop

2. Cost-effectiveness

3. Increased durability

4. Better grounding

The correct answer is: Increased durability

Using multiconductor cable for underground service provides increased durability, which is essential for withstanding the harsh conditions often encountered in underground installations. These cables are designed to resist moisture, chemicals, and other environmental factors that can lead to deterioration over time. The robust construction of multiconductor cables typically includes insulation that can withstand physical stresses and potential abrasions, which are typical in underground settings. While reduced voltage drop, cost-effectiveness, and better grounding are important considerations when selecting electrical components, they are not the primary advantages of multiconductor cables in underground applications. Reduced voltage drop can often be managed through proper sizing and installation practices rather than being a specific advantage of using multiconductor cables. Similarly, cost-effectiveness is influenced by various factors aside from the cable type itself, such as installation practices and local material costs. Grounding issues are usually addressed through separate grounding systems rather than being inherently improved by choosing multiconductor cables. Thus, the primary advantage in the context of durability is why multiconductor cables are favored for underground installations, ensuring long-term reliability and reducing the need for frequent maintenance or replacements.