Red Seal Construction Electrician Practice Exam

What is the maximum allowable voltage between grounded parts in a system?

1. 5 volts

2. 30 volts

3. 0 volts

4. 120 volts

The correct answer is: 0 volts

In electrical systems, the concept of grounded parts refers to conducting materials that are intentionally connected to the ground for safety reasons. The maximum allowable voltage between these grounded parts is stipulated to be zero volts in a properly designed and functioning system. This ensures that, in normal operation, there should not be any voltage present between these grounded components. In practice, this condition is essential to minimize the risk of electric shock or equipment damage. If there were a measurable voltage present between grounded parts, it could indicate a fault in the grounding system, leading to potential hazards. Thus, maintaining zero volts between grounded parts is a critical design requirement in electrical installations to ensure safety and reliability. The other options represent voltage levels that could pose risks in various electrical scenarios, which is why they're not acceptable in this context.