第61页 Section 690.12 rapid shutdown

In the 2014 NEC, 690.12(2) first stated that controlled conductors shall be limited to not more than 30V and 240 volt-amperes within 10 seconds . The 2014 NEC 690.12(2) was changed in 2016 from 10 seconds to 30 seconds via a TIA . The reason for this change was to allow product manufacturers to address grid support requirements that may require that the PV array stay on for up to 20 seconds during utility grid problems. It also allows more time for the capacitors on the dc side of the inverter to discharge in 30 seconds. The fire service also agreed that the danger to firefighters would not change significantly with the time increase.