The National Electrical Code (NEC..) in the latest version of NEC 2017--690.12 (B) clearly states that the photovoltaic system needs to have a rapid shutdown function at the module-level. This requirement will take effect on January 1, 2019.
SunSpec Alliance followed the NEC 2014, NEC 2017, UL 1741 norms to establish a rapid shutdown standard. Meet the more stringent module-level requirements of the 2017 National Electrical Code (NEC).
National Electrical Code(NEC) only applies to residential power stations on buildings. The 2014 specification requires a safe area around the photovoltaic system of 3 meters. The 2017 specification requires that the safe area around the photovoltaic system is 1 foot approximately equal to 30CM, which is a module-level shutdown.
UL 1741 (PV Installation Standard) added PV rapid Shutdown Device (PVRSE) and PV rapid Shutdown System (PVRSS). The next edition of UL 1741 will require PVRSE and PVRSS to meet NEC2017’s rapid shutdown regulations.
The specific requirements of NEC 2017
Take the distance to the PV array 30.5cm as the A line.
Take the distance 1m from the building surface as the B line.
1. After press the button. Voltage of outside A line should be under 30V and Voltage of inside of A line should be under 80V. That is module-level shutdown.
2.After press the button. Voltage of outside B line should be under 30V and Voltage of inside of B line should be under 80V.
3.The switch of rapid shutdown should be able to show the status of system whether it on or off. Also need be mount on the outside of the build for. easy to reach.
4. Solar system require sticker of rapid shutdown and instruction.
