Nearly a decade after its 2017 debut in the National Electrical Code, the requirement for rapid shutdown of rooftop solar arrays to protect firefighters from high-voltage DC hazards remains contentious. Installers report that power-electronics devices often overheat or fail under harsh rooftop conditions, while engineering firm HelioVolta's inspection of 5 GW of projects uncovered connector issues in 83% of sites.
Manufacturers and safety advocates now push for:
- Stricter UL-listed connector standards
- Automatic self-diagnosing rapid shutdown devices
- Enhanced installer training on module-level power electronics
Until these gaps are closed, stakeholders warn that firefighter safety and system reliability will hang in the balance.
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