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  • White Paper

PV Rapid Shutdown: Safety Requirements and Communication

This UL white paper identifies key updates and revisions to requirements for PV rapid shutdown systems and explores the future state of communication systems under UL 1741.

Firefighters working on roof

Photovoltaic (PV) technology is developing rapidly and we are seeing rooftop solar PV arrays become more commonly installed on residential homes and commercial properties. While PV array equipment is required to be certified for safety from risk of shock and fire, those certifications do not account for all of the specific interactions with firefighters working around the array while fighting a fire. The updated Standard defines requirements for PV rapid shutdown equipment (PVRSE) and PV rapid shutdown systems (PVRSS) to reduce hazards for firefighters while performing their duties on or in buildings with PV arrays.

 

Download this white paper to:

  • Learn more about the updates and revisions to requirements for PV rapid shutdown equipment and systems in UL 1741.
  • Understand the differences between PVRSE and PVRSS.
  • Find out more about the considerations of NRTLs in PVRSS system certifications including system level timing requirements, end-to-end functionality, and more.
  • Learn more about the future state of communication systems and the revision proposal in UL 1741 to apply functional safety requirements in combination with standardized communication methods.

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