About Latest policy on photovoltaic circuit boards
Section 690.1, Scope.Informational Notes, Figures 690.1(a) and (b) have been combined into one figure Informational Note, Figure 690.1. This.
Section 690.41(A), PV System Grounding Configuration, has minor rewording for clarity. Section 690.42, Point of System Grounding Connection, has been retitled Point of PV System DC.
691.1 Scope.Informational Note No. 1 now has a reference to Section 691.4. The Definitionsin 691.2 been moved to Article 100. 691.4 Special Requirements for Large-Scale PV Electric.
The sections related to PV Rapid Shutdown in this part have been moved to 690.12. There are three sections in this part now. Section 690.56, Identification of Power Sources, refers to the requirements in article 705.10.Section.
See photo 4. Section 705.1, Scope. A second Informational Note has been added to this section. The Definitions in Section 705.2have been moved to Article 100. A new Section 705.5, Parallel Operation, has been.
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6 FAQs about [Latest policy on photovoltaic circuit boards]
Where can I find a report on photovoltaic modules?
This report is available at no cost from the National Renewable Energy Laboratory (NREL) at Smith, Brittany L., Michael Woodhouse, Kelsey A. W. Horowitz, Timothy J. Silverman, Jarett Zuboy, and Robert M. Margolis. 2021. Photovoltaic (PV) Module Technologies: 2020 Benchmark Costs and Technology Evolution Framework Results.
Does ul 3741 require a conductor inside a solar array?
The requirements for conductors outside the array boundary (1 ft from the array in all directions) hasn’t changed, but the code now allows the use of PV hazard control systems that are certified to the UL 3741 standard for conductors inside the array, such as the upcoming P1101 optimizer from SolarEdge.
What are the labeling requirements for rapid shutdown-equipped PV systems?
The labeling requirements for rapid shutdown-equipped systems were modified within Article 690.56 (C). The label verbiage for array-level rapid shutdown was removed since all rooftop PV systems complying with NEC 2020 will now require de-energization at the module-level.
Why do PV systems need a matched connector?
The concern of arcs caused from mismatched connectors resulted in the 2020 NEC adding in 690.33 (C) the requirement that mating connectors either be identical type and brand or listed and identified for intermatability. Reducing the complexity of the PV system will increase the reliability, reduce injury risk and decrease likelihood of fire.
How to reduce ground fault occurrences in PV DC?
Reductions in the number of DC connections and improvements in wire management methods can further reduce ground fault occurrences. PV DC ground fault detection is an important safety feature that indicates when either the positive or negative conductor unintentionally establishes a lower resistance (fault) path to ground.
How is a ground fault detected in a PV inverter?
Because the PV array DC circuits were referenced to ground on the DC side of the inverter, the first ground fault detection was simply detecting current flow through the DC ground reference, such as by a fuse in the ground reference path.
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