What wire might be used if there are many windows to save costs?

• A. 22/2 saves a few dollars
• B. 24/2
• C. 18/4
• D. 16/2

Answer: (A)

When wiring many windows, the goal is to use a simple, inexpensive path that's still reliable for low‑current window contacts. Door/window sensors only need a basic two‑conductor low‑voltage run, so a standard two‑conductor alarm wire is typically used. It provides enough durability for installation without adding extra complexity or cost, which is why this option is the sensible choice for covering many openings.

A thinner option would save a bit more, but it may be less durable and more prone to damage during installation. A four‑conductor cable adds unnecessary conductors for simple window sensors, and a thicker, power‑rated cable is more expensive and designed for higher current—not needed for these sensors.