Multistrand/Solid Core Wire: Which type offers greater flexibility for buried irrigation installations?

• A. Solid Core
• B. Shielded Cable
• C. Multistrand
• D. Coaxial

Answer: (C)

For buried irrigation wiring, flexibility matters because the trench may require bends, turns, and some soil movement over time. A solid core wire is a single, rigid conductor. It doesn’t bend easily, so it’s more likely to kink or crack insulation if you try to route it around obstacles or through tight bends, which can lead to damage over the life of the installation. Multistrand wire, on the other hand, is made of many fine strands bound together. Those numerous strands allow the conductor to flex repeatedly without breaking, so it can bend along curves and adapt to ground movement without compromising the insulation or the connection. Shielded cable adds a metal shield to reduce interference, which isn’t typically needed for irrigation circuits and adds stiffness and cost. Coaxial cable is designed for signal transmission and isn’t suited to low-voltage irrigation power or control wiring. So the multistrand option offers the required flexibility for buried installations.