Tag: code
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Solis, Sollega showcase one example of UL 3741-listed system
UL 3741 listed systems, or PV hazard control system (PVHCS) as they were termed in NEC 2023, are a hot topic in C&I solar. UL 3741 provides an alternative to the previous sole solution of utilizing MLPEs on all rooftop PV arrays to meet the 690.12 requirements for conductors inside the array boundary. From the……
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The difference between UL 9540 and 9540A
By: Lucas Miller – Senior Engineering Consultant, Mayfield Renewables In 2018, the California Solar Energy Industries Association (CALSEIA) rebranded to become the California Solar and Storage Association (CALSSA). Their justification was simple: it was a move that “recognizes solar’s central role in the future of the U.S. electricity generation mix while acknowledging its next evolution……
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Fire safety code conundrums continue for battery suppliers
Manufacturers of batteries for stationary energy storage are facing a moving target for fire safety code as written by the leading U.S. defining body for fire safety, the National Fire Protection Association (NFPA). NFPA Code 855 is now in its third iteration, with a fourth and fifth already in the works. National electric codes follow……
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Solar inverter pros discuss UL 3741 and UL 1741
As part of our 2023 Solar Inverter Buyer’s Guide, we asked inverter manufacturers for their thoughts on new standards UL 3741 – the listing to meet the PV Hazard Control subsection of NEC 690.12(B)(2) to comply with rapid shutdown – and UL 1741 – the listing to meet interconnection requirements set by the IEEE 1547-2018……
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Rapid shutdown, connectors, supply chain leave few good options for safe PV system design
They say the best way to learn is by first making mistakes. Well, for most solar businesses, that might not be the best path to a higher education. Instead, let’s assess the mistakes that are commonly being made in PV system design and installations so that we can avoid them ahead of time. For our……