Pure Power Engineering

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. What happens when there are two separate subarrays feeding the same inverter, or the subarrays are greater than 10' apart? [ 1,060 more word ]

http://purepower.com/nec-690-12-rapid-shutdown-length/

Rapid Shutdown – More on Conductor Length What happens when there are two separate subarrays feeding the same inverter? The code doesn't clearly state how to approach this scenario so Pure Power looks at the philosophy of the code and what it is trying to achieve, and develops an interpretation consistent with the intent of the code. Contin...

NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs

http://purepower.com/nec-690-12-rapid-shutdown-of-pv-systems-on-buildings/

NEC 690.12 Rapid Shutdown for String Inverters on Flat Roofs 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. Continue Reading →