This requirement is called a rapid shutdown.
Rapid shutdown solar panels requirements.
Pv system circuits installed on or in buildings shall include a rapid shutdown function that controls specific conductors in accordance with 690 12 1 through 5 as follows.
Safety capability requires cloud connect and gateway for communication see design tool systems requiring safety functionality such as rapid shutdown should have ts4 f or higher on all modules.
Compliant with nec 690 12 rapid shutdown requirements.
The section 690 12 update to the 2017 national electrical code nec calls for module level rapid shutdown of solar systems instead of nec 2014 array level shutdown requirement.
Pv rapid shutdown requirements were added to nec 2014 690 12 to improve electrical and fire safety hazards namely for first responders.
Rsd tigo for nec 2017.
2017 nec 690 12 rapid shutdown.
These conductors must be de energized to below 30 and 240 vac within 10 seconds of initiating rapid shutdown.
The national fire protection association nfpa wrote rapid shutdown requirements into the nec in an effort to keep first responders safe.
Currently string inverters require listed add ons to be rapid shutdown compliant.
In 2014 the national electrical code included a new requirement.
That transmitter is paired with a sensor that s attached to the array.
2 inside the array boundary.
Hopefully your home never catches on fire and you don t even have to worry about rapid shutdown functionality but if it does firefighters can use rapid shutdown solutions to de energize your solar panel system just in case they need to go up on your.
Starting in 2019 when nec 2017 goes into effect in certain jurisdictions all conductors within a 1ft boundary of an array has to be reduced to 80 v or less within 30 seconds of rapid shutdown initiation.
Conductors that extend greater than 10 ft from the array outside or more than 5 ft inside a building are required to be de energized upon command of shutdown.
690 12 1 through 5 a short requirement only six sentences.
Controlled conductors located outside the boundary or more than 1 m 3 ft from the point of entry inside a building shall be limited to not more than 30 volts within 30 seconds of rapid shutdown initiation.
It is against metropolitan and municipal fire code for solar systems connected to the grid to stay turned on when the grid is down which demands the need for a rapid shut down mechanism in solar panels.
More than 5 inside a building or more than 10 from a pv array.
Same string design rules as traditional modules.
However this isn t what happens and for good reason.
The section 690 12 update to the 2017 national electrical code nec calls for module level rapid shutdown of solar systems instead of nec 2014 s array level shutdown requirement.
Voltage shall be measured between any two conductors and between any conductor and ground.
