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The 2017 National Electric Code (NEC) dramatically changes the requirements for "Rapid Shutdown of PV Systems on Buildings." Half of the states already adopted NEC 2017 and several more will in the next few months (such as NJ and CT), so you..

Its common knowledge that Aluminum (Al) conductors cost less than Copper (Cu). But how big is the difference in price? The answer may shock you.

Our first article 2014 NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs we explained the basics of implementing a rapid shutdown system using string inverters on a roof.  In that article, we gave a simple example of a single array.