Master Electrician Practice Exam

Which of the following is a typical voltage for low-voltage applications?

1. 50 volts

2. 120 volts

3. 480 volts

4. 600 volts

The correct answer is: 50 volts

Low-voltage applications typically operate at voltages that are significantly lower than standard line voltages. A common threshold for identifying low-voltage is 50 volts or below, which is often used in various applications such as communication systems, control circuits, and even some lighting configurations. This lower voltage is generally considered safer, reducing the risk of electrical shock hazards and allowing for the use of lighter insulation and less stringent installation criteria. The other choices reflect standard line voltages used in industrial and residential applications. For instance, 120 volts is a typical voltage for household outlets and lighting, while 480 volts is commonly used in industrial equipment and three-phase systems. Additionally, 600 volts is typically found in commercial and industrial settings, often for powering larger machinery. Therefore, 50 volts stands out as the only option that fits the category of low voltage.