What is a notable advantage of stranded wire in alarm installations?

• A. Higher Resistance.
• B. Harder To Pull.
• C. Has More Surface Area.
• D. More Likely To Suffer Metal Fatigue.

Answer: (C)

Stranded wire has more surface area than a solid conductor of the same overall size because it’s made up of many fine strands. That extra surface area translates into practical benefits in alarm work: it can help with heat dissipation along the length of the wire and provides more copper surface for reliable contact at terminals and clamps. In installations where wires run in tight spaces and may flex, stranded wire’s multiple strands also let it bend more easily without breaking. The increased surface area is the most notable advantage in this context. The other statements don’t fit: resistance is essentially the same for the same cross-sectional area, stranded wire is easier to pull (not harder to pull) due to its flexibility, and it’s less prone to metal fatigue, not more likely to suffer it.