PV hazard control is a way of reducing electric shock hazard from energized PV equipment and circuits inside a PV array, so firefighters can stay out of hazardous current paths. A PV hazard control system can be one piece of equipment or several coordinated pieces, and it is evaluated to UL 3741. Under the 2020 and 2023 NEC, a listed PV hazard control system is one of the permitted methods for meeting rapid shutdown requirements inside the array boundary. If the system needs a trigger to reach its controlled state, the rapid shutdown initiator performs that initiation. A typical system can include modules, approved racking, inverters, rapid shutdown components, wire management, conduit, and compliance placards. Install the system exactly as its listing instructions say, and replace parts only with certified hazard control equipment that carries the same or better ratings, or the system may no longer be compliant. Check with the local utility and the authority having jurisdiction about which compliance method they prefer.
related_toc1 drafted · lead UL 3741 proposed
UL 3741 is the standard used to evaluate PV hazard control components, equipment and systems.
sec=h2 h=8d4f642e59d2sec=h66 h=76108b790475sec=h48 h=d7e4bde5a07dsec=h11 h=1d560fe853bbsec=h12 h=debcafe0ad5dc2 drafted · lead NEC 2023 690.12 Rapid shutdown of PV systems on buildings proposed
Scope: standard NFPA 70 (NEC) 2023 proposed
The 2020 and 2023 NEC both allow a listed PVHCS for rapid shutdown inside the array boundary.
sec=h48 h=d7e4bde5a07dc3 drafted · lead PV rapid shutdown
sec=h48 h=d7e4bde5a07dsec=h66 h=76108b790475sec=h11 h=1d560fe853bbc4 drafted · lead Rapid shutdown initiator
When a hazard control system needs initiation to reach its controlled state, the rapid shutdown initiation device performs it.
sec=h66 h=76108b790475sec=h48 h=d7e4bde5a07dc5 drafted · lead Array boundary
sec=h66 h=76108b790475sec=h48 h=d7e4bde5a07dc6 drafted · lead Listed equipment
sec=h66 h=76108b790475c7 drafted · lead Electric shock
PV hazard control reduces shock hazard from energized circuits in a damaged PV array during firefighting.
sec=h2 h=8d4f642e59d2sec=h66 h=76108b790475c8 drafted · lead Generac PWRcell Inverter (X7602, XVT076A03, XVT114G03)
Listed as UL 3741 PVHCE; may be installed as part of a PVHCS.
sec=h17 h=1bd168492dc0sec=h48 h=d7e4bde5a07dc9 drafted · lead Generac PV Link
The S2502HC PV Link is UL 3741 listed PVHCE.
sec=h48 h=d7e4bde5a07dsec=h17 h=1bd168492dc0related_to c11