In some installations, solid vs stranded conductor choice is not optional. Which statement is true?

• A. Some jurisdictions require solid wire; some alarm types require solid wire
• B. Solid wire is always preferred over stranded
• C. Stranded wire is always required in alarms
• D. It does not matter for most installations

Answer: (A)

Conductor type matters because fixed wiring and device terminations interact with both code requirements and the equipment’s design. In many installations, solid copper is preferred for in-wall or fixed runs because it holds its shape, is easier to pull through conduit, and many codes specify solid for permanent wiring. At the same time, some alarm devices or terminals are designed to accept stranded wire or require specific terminations, so certain alarm types effectively dictate solid wire for proper connection. Because these rules can vary by jurisdiction and by the particular alarm equipment, there isn’t a universal rule that applies to every situation. Check local electrical code requirements and the manufacturer’s installation instructions to determine which conductor type is acceptable for a given install.