The UL3741 Standard for Photovoltaic Hazard Control allows for both module-level power electronics (MLPE) and non-MLPE solutions. The UL standard outlines rapid shutdown requirements for PV systems, and while the requirement first appeared in the 2014 National Electrical Code (NEC), it wasn’t until 2021 that equipment started carrying the UL3741 label. According to UL, the standard was developed to protect firefighters from shock hazards when responding to emergencies in homes and buildings with solar arrays. It is recognized and approved by the American National Standards Institute (ANSI) and the Standards Council of Canada.
Industry experts say that some non-MLPE solutions, while NEC compliant, raise safety concerns as they leave the DC array at high voltage levels (1000VDC) during rapid shutdown. This can be seen as a step back in safety, particularly for firefighters.
By assembling a panel of experts, Bill Brooks, principal at Brooks Engineering, Jason Bobruk, director of Code Compliance at Solaredge, Anthony Granato, president at Energy Response Solutions LLC, and Lucas Titolo, VP Engineering at Solar Landscape, to critically examine the risks and drawbacks of non-DC optimized solutions, especially in rooftop applications, webinar’s partner Solaredge demonstrates its commitment to a safer approach to UL3741 compliance. The panel in this pv magazine Webinar will cover topics such as compliance with codes and standards, design considerations, and the risks posed to firefighters and O&M workers when working around rooftop arrays. Panelists include experts in codes and standards, project development, and firefighting.
pv magazine Webinar content:
- Understand the real intent of UL3741 code standard.
- Understand the potential risks associated with solutions that do not use DC optimization.
- Get insights into the design considerations and code compliance requirements for rooftop PV arrays and discuss best practices for ensuring safety and compliance.
Questions can be submitted beforehand in the comments window when registering or in the chat during the live webinar. Anne Fischer, senior editor at pv magazine USA, will be the moderator of this webinar.
Registration for this pv magazine webinar is free of charge.