What is the purpose of wire nuts in electrical connections?

• A. To measure insulation resistance.
• B. To insulate bare wires with heat shrink.
• C. To safely join two or more conductors with a mechanical connector.
• D. To prevent moisture ingress in panels.

Answer: (C)

Wire nuts are used to safely join two or more electrical conductors with a twist-on mechanical connector that both makes the electrical connection and insulates the wires. Twisting the conductors together inside the cap grabs them securely and covers the exposed metal, creating a continuous circuit while preventing exposed conductors from touching each other or other conductive surfaces. This is different from measuring insulation resistance, which uses testing equipment; it’s not about insulating with heat shrink, and it doesn’t address moisture ingress in panels. So the purpose is to create a secure, insulated connection between conductors.