As of January 1, 2015, several changes to the California Building Code and the California Residential Code have gone into effect. The changes apply to rooftop-mounted photovoltaic systems, also called PV systems, installed on residential, commercial and public buildings. Specifically, the code changes require that all PV systems be tested, listed and identified with a fire classification rating in accordance with UL 1703.
History of UL 1703 and PV Systems
Before 2013, PV systems were only subject to fire testing when they were stand-alone components – not when installed or mounted on a building. In 2013, UL 1703’s fire classification requirements changed, requiring all PV systems be tested for flammability characteristics. This test includes the PV module, the roof rack, and the roof itself, and is to be conducted by one of the Nationally Recognized Test Labs. UL, TUV, CSA and Intertek are all labs included on this list.