Technical Standards and Safety Authority (TSSA) G3 Practice Exam

What type of fastener is used to join two electrical conductors?

1. electrical coupling

2. BX connector

3. wire nut

4. electrical tape

The correct answer is: wire nut

The use of wire nuts is a common and effective method for joining two electrical conductors. Wire nuts are twist-on connectors that are designed to securely hold wire connections together while also insulating them to prevent electrical shorts. When two or more wires are twisted together and then covered with a wire nut, the connection is not only mechanically secure but also protected from moisture and environmental factors. Wire nuts come in various sizes to accommodate different wire gauges, ensuring a proper fit for safety and performance. This type of fastener is particularly useful in residential wiring practices, allowing for quick and reliable connections without the need for additional tools or special handling. The insulation provided by wire nuts also contributes to the overall electrical safety of the installation, which is crucial in any electrical work. In contrast, other options like electrical couplings, BX connectors, and electrical tape serve different purposes. Electrical couplings are primarily used to connect two sections of conduit, BX connectors are specific to armored cable connections, and electrical tape is mainly used for insulating or securing wires rather than making a solid electrical connection. Thus, wire nuts are the most suitable choice for joining electrical conductors.