Aire and XR can now be installed without MLPE devices.
The IronRidge Aire and XR Flush Mount Systems are now listed to UL 3741 with Tesla, Solis, and MidNite Solar equipment. This allows for system design on residential roofs (up to 600V) without the use of Module-Level Power Electronics, which reduces material, installation, and service costs. Refer to the Installation Addendum for detailed instructions for compliance.
PV HAZARD PREVENTION ON BUILDINGS
The UL 3741 Standard for Photovoltaic Hazard Control was published in late 2020. It is now referenced in the 2020 National Electric Code (NEC) 690.12 B (2) as an option to comply with rapid shutdown requirements. IronRidge’s XR Flush Mount UL 3741, Photovoltaic Hazard Control System (PVHCS) listing, allows systems to be designed up to 600V without the need for module-level power electronics (MLPE).
UL 3741 SYSTEM BENEFITS
A UL-3741-compliant Aire or XR Flush Mount system can be designed without the use of Module Level Power Electronics (MLPE). The use of a String Isolation Device (SID), like the Tesla Mid-Circuit Interrupter (MCI), can dramatically lower component count, leading to higher reliability and reduced service costs.
USING THIRD-PARTY EQUIPMENT
The IronRidge Aire and XR Flush Mount systems are listed to UL 3741 with Tesla’s MCI-1 string isolation device (SID) in combination with either a Tesla PV Inverter, Powerwall+, or Powerwall 3 Power Conversion System (PCS). They are also listed to UL 3741 with MidNite Solar’s SID (MNSSR-600S-SS) in combination with select Solis 4G Grid-Tied Inverters. Guidance on system configuration with third-party equipment is outlined in the UL 3741 Installation Addendum, available on the IronRidge website.
WIRE MANAGEMENT & SAFETY CONCERNS
Proper wire management is crucial for UL 3741 compliance and requires that all wires be routed in a manner that prevents exposure to potential Fire Fighter (FF) interactions, such as routing wires under modules or through approved listed raceway for wires running between arrays.
IronRidge Edge Clips (BX-CT-EC-PZ) and Cable Ties (BX-CT-UV-PZ) are wire management components that are evaluated to UL 1565 (wire positioning) and/or UL 62275 (cable ties) and are approved for use. They are part and the UL 3741 Listing. A listing of approved PV Hazard Control Equipment or components is provided in the UL 3741 Installation Addendum.
