Red Seal Industrial Electrician Practice Exam

What is the purpose of an isolation switch?

1. To increase electrical output

2. To disconnect power for maintenance work

3. To regulate the flow of electricity

4. To measure electrical load

The correct answer is: To disconnect power for maintenance work

The purpose of an isolation switch is to disconnect power for maintenance work. This device ensures that when maintenance or repair activities are carried out, the designated circuits or equipment are completely de-energized. By using an isolation switch, workers can safely perform their tasks without the risk of electrical shock or accidental energization. It creates a physical break in the electrical circuit, allowing for safe access to the electrical components. The other answers pertain to functions not associated with an isolation switch. For instance, increasing electrical output involves adjusting system parameters or configurations, while regulating the flow of electricity could involve devices like variable frequency drives or dimmers, which manipulate the power delivery rather than isolating it. Measuring electrical load typically relies on instruments such as ammeters or wattmeters, which are designed for monitoring and assessment rather than for ensuring safe disconnection for maintenance purposes.