All questions and answers are based on the 2011 NEC. Q. What are the grounding electrode requirements for a separately derived system, such as a transformer? [250.30(A)(4)] A. First of all, let’s ...

All questions and answers are based on the 2014 NEC. Q. How do we size the conductors and maximum overcurrent protection for an electric water heater? Please give an example. A. An electric water ...