Journeyman Electrician Practice Exam

Which material is prohibited from being used as grounding electrodes and must meet specific gauge requirements?

1. Aluminum

2. Steel

3. Copper

4. Pipe or conduit

The correct answer is: Pipe or conduit

The use of pipe or conduit as grounding electrodes is subject to specific regulations outlined in the National Electrical Code (NEC). While certain types of pipe and conduit can indeed be utilized for grounding purposes, they must meet established specifications for size and material. The NEC prohibits the use of certain types of pipe or conduit that do not meet these criteria, particularly when it comes to ensuring a low resistance ground. Aluminum, steel, and copper are all materials that can be used for grounding electrodes, provided they meet the required specifications. Copper is widely recognized for its excellent conductivity, aluminum is lighter and can be effective as well, and steel can be treated or plated to enhance its conductivity. However, the key takeaway is that for pipe or conduit to be acceptable as grounding electrodes, they have to be properly sized and manufactured to meet the necessary code requirements. This highlights the importance of adhering to specific gauge requirements and regulations in grounding systems to ensure safety and effectiveness.