ABYC Marine Electrical Practice Exam

What is a common material used in the manufacturing of electrical insulators?

1. Copper

2. Glass

3. Aluminum

4. Iron

The correct answer is: Glass

Glass is a common material used in the manufacturing of electrical insulators primarily due to its excellent insulating properties. It is non-conductive, meaning it does not allow electricity to pass through, which is essential for preventing electrical shorts and ensuring safety in electrical circuits. Glass insulators effectively withstand high voltages and are resistant to environmental conditions such as moisture and temperature variations. This makes glass a reliable choice, especially for outdoor electrical applications where long-term durability is critical. In comparison, metals like copper, aluminum, and iron are conductive materials, making them unsuitable for use as insulators. While they are excellent for conducting electricity, their properties do not provide the insulation needed to separate electrical components and prevent unwanted current flow. Thus, glass stands out as an appropriate insulator in various applications within electrical systems.