What is a bonded wire connection?

• A. Twisted pair
• B. Soldered
• C. Crimped
• D. Welded

Answer: (B)

A bonded wire connection is one that relies on a metallurgical joint created by soldering. soldering uses a filler metal that melts and wets both conductors, then solidifies to form a continuous electrical path and a strong mechanical bond. This is why soldered joints are described as bonded—they become a single metal connection once cooled. Twisted pair isn’t bonded; it’s just two wires interwoven, relying on insulation and contact rather than a metal-to-metal bond. A crimped connection is made by compressing a sleeve around the conductors for a mechanical and electrical hold, not by creating a soldered metal bond. Welding fuses metals together, which is generally unnecessary and impractical for small alarm wiring. So, soldered is the best match for a bonded wire connection because it provides a true metal-to-metal bond with low resistance and durable connection.