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Fronius Symo Advanced is UL 3741 certified

What is UL 3741?

UL 3741 is a solution to the NEC 690.12 requirement of module level rapid shutdown within a photovoltaic (PV) solar system.  According to UL’s website, UL 3741 provides “a means of evaluation for PV hazard control components, equipment and systems that reduce shock hazards from energized PV system equipment and circuits in a PV array. It is specifically intended to establish and expand requirements for the evaluation of a rapid-shutdown PV array that can keep firefighters out of hazardous current paths when responding to emergency situations in homes and buildings with PV systems.”

NEC 690.12 background

2020 NEC 690.12 Rapid Shutdown of PV Systems on Buildings requires that all PV arrays installed on buildings shall include rapid shutdown functions to reduce shock hazard for Fire Fighters in accordance with 690.12 (For further information regarding NEC 690.12, refer to manufacturer’s website)

The solution

Fronius Symo Advanced

The Fronius Symo Advanced string inverter is UL 3741 certified for use with listed flat roof systems when the inverter is installed within the 1 ft array boundary. This certification eliminates the need for module level rapid shutdown devices. When modules are properly mounted with either of these UL 3741 approved PV Hazard Control commercial installation systems, the Fronius Symo Advanced is NEC 690.12 compliant.

 

All mounting systems are UL 3741 certified according to 2023 NEC 690.12 Controlling Conductors within the array boundary (Also compliant with the 2017 and 2020 versions of the NEC). 

 

 

 

UNIRAC®

UNIRAC® Flat Roof Systems (RM10 EVO, RM10 LEGACY, RMDT, RM5, ECOFOOT 2+, ECOFOOT 5D, GRIDFLEX 5) are UL 3741 Listed systems that comply with NEC 690.12 when installed by qualified persons per the installation procedures outlined in the UNIRAC® UL 3741 Installation Guide.

 

For installation instruction manuals, procedures and product requirements, click the link below to be directed to manufacturer’s website

More about UNIRAC®

 

 

 

    

IRONRIDGE®

The BX Ballasted flat roof Photovoltaic Hazard Control System (PVHCS) is a UL 3741 Listed system that complies with NEC 690.12 when installed by qualified installers per the installation procedures outlined in the BX System Installation Manual.

 

For installation instruction manuals, procedures and product requirements, click the link below to be directed to manufacturer’s website.

More about IRONRIDGE®
For more insight into this UL 3741 solution, watch our webinar: Navigating Rapid Shutdown with Fronius and IronRidge®
Click here to access the webinar

 

 

 

PANELCLAW®

The clawFR Photovoltaic Hazard Control System (PVHCS) is a UL 3741 Listed system that complies with NEC 690.12 when installed by qualified persons per the installation procedures outlined in the clawFR System Installation Manual.

 

For installation instruction manuals, procedures and product requirements, click the link below to be directed to manufacturer’s website.

More about PANELCLAW®

 

 

 

 

 

 

 

 

 

SCHLETTER®

The FixGrid Pro flat-roof mount is a UL 3741 Listed system that complies with NEC 690.12 when installed by qualified installers per the installation procedures.

 

For installation instruction manuals, procedures and product requirements, click the link below to be directed to manufacturer’s website.

More about SCHLETTER®

 

 

 

AEROCOMPACT®

The COMPACTFLAT S bracket-based flat roof system is a UL 3741 Listed system that complies with NEC 690.12 when installed by qualified persons per the installation procedures.

 

For installation instruction manuals, procedures and product requirements, click the link below to be directed to manufacturer’s website. 

More about AEROCOMPACT®

 

 

 

    
    

Fronius rooftop solution

It is required by Fronius USA, in accordance with our installation manual, that the Fronius Shade Cover be used when the Fronius Symo Advanced is installed in direct sunlight.

 

This solution allows you to:

  • Place inverter next to array
  • Lay flat or tilt up

 

Benefits:

  • Protects from harsh weather conditions
  • Keeps inverter’s temperature low and performance high
  • UL 3741 code compliance
    


Disclaimers

  • Fronius is not affiliated with Esdec Solar Group
  • PanelClaw® and IronRidge® are not Fronius products
  • Fronius is not responsible for installation or support of PanelClaw® or IronRidge® racking systems. It is the installer’s responsibility to comply with all applicable national, state or local codes, procedures, and product and safety standards, follow installation instructions provided by manufaturer, use recommended parts, and ensure proper electrical requirements. For more information about installer’s responsibilities, visit the manufacturer’s website. (LINKS ABOVE)
  • The Fronius Symo Advanced is the only Fronius inverter that is certified under UL 3741.  This certification does not include the Primo or Symo models.