Code Quiz: Article 250, Part 8

Based on the 2008 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Codebookcity.com. He is a former editor of an electrical magazine were he edited Code articles.

1. To avoid electrical noise on the building structure from entering sensitive equipment, you should ensure the respective grounds are...what?
    

2. Name three types of grounding electrode permitted by Article 250, Part III.
    

3. What system can you not use as a grounding electrode?
    

4. What material cannot be used for a grounding electrode?
    

5. What's the minimum spacing you must have between grounding electrodes?