Code Quiz: Article 250, Part 12

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. When you enclose grounding electrode conductors, what requirement do ferrous enclosures have to meet that non-ferrous enclosures don't?
    

2. What table serves as the reference for sizing grounding electrode conductors for AC systems?
    

3. The connection of a grounding electrode conductor or bonding jumper to a grounding electrode must be made in a manner that ensures what?
    

4. Can you connect more than grounding electrode conductor to a grounding electrode?
    

5. Do you want to keep other metal enclosures separately grounded from service enclosures or do you bond them to the grounding electrode system?