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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 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.
The 2014 National Electric Code added a new section of code 690.12 requiring "Rapid Shutdown of PV Systems on Buildings". Below is the first of 1 of 2 articles we put together to help you understand this code (here is the other: Rapid Shutdown -..