Twist-on connectors are called what?

• A. Ground clamps
• B. Wire nuts
• C. Terminal block
• D. Fuses

Answer: (B)

Twist-on connectors are the devices used to join two or more wires by twisting a cap onto them. The cap contains internal springs or metal bites that grip the stripped conductors, creating a secure electrical connection and insulating seal. They’re commonly called wire nuts because many early versions looked like threaded nuts you twist onto wires, and the term has stuck. These connectors come in color-coded sizes to match different wire gauges and the number of conductors, so using the right size is important for a reliable, heat‑safe splice. They’re used in junction boxes, outlets, and switches to make quick, reusable wire splices. They’re not ground clamps, which attach grounding conductors; not terminal blocks, which are a different kind of multi-terminal connector; and not fuses, which provide protection from overcurrent. If wiring aluminum, choose twist-on connectors rated for AL-CU compatibility and consider using antioxidant paste.