Quick Answer
Solar panels on flat roofs can meet NEC 690.12 requirements with proper design and installation, including using rapid shutdown devices that can disconnect DC power within 10 seconds of turning off the main disconnect.
Understanding NEC 690.12 Requirements
The National Electric Code (NEC) 690.12 requires that solar electric systems be capable of disconnecting DC power within 10 seconds of turning off the main disconnect. This standard is intended to reduce the risk of electrical shock and improve safety for solar system installers and homeowners. To meet this requirement, solar panel manufacturers and installers use rapid shutdown devices that can quickly disconnect DC power from the electrical grid.
Designing for Rapid Shutdown on Flat Roofs
When designing solar systems for flat roofs, installers must consider the unique challenges of rapid shutdown. Flat roofs often have limited space for mounting equipment, making it essential to choose rapid shutdown devices that are compact and easy to install. Installers should also ensure that the rapid shutdown device is located in a readily accessible location, such as the main disconnect box or a nearby junction box. This allows for quick and easy disconnection of DC power in the event of an emergency.
Installing Rapid Shutdown Devices on Flat Roofs
When installing rapid shutdown devices on flat roofs, installers should follow the manufacturer’s instructions and the NEC requirements. This includes ensuring that the device is properly sized for the solar array and that it is installed in a location that is protected from the elements. Installers should also test the rapid shutdown device to ensure that it is functioning correctly and can disconnect DC power within the required 10-second timeframe.
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