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NEC 690 Photovoltaic Power Systems

May 26 @ 12:00 pm - 1:00 pm

NEC 690 Presentation Overview NEC Article 690 covers the requirements of the engineering and construction of solar photovoltaic systems. In just a few iterations of the NEC, Article 690 has transformed considerably. Essential calculations, including module open circuit voltage and short circuit current have evolved and bifacial modules have enhanced the need for refined calculations. This presentation will address these topics along with an understanding of the risk associated with different interpretations and calculation methodologies. ====== Code requirements for the Photovoltaic Power Systems NEC (National Electrical Code) section 690. Part II of Article 690 provides the circuit requirements for PV systems vs wiring methods and materials (covered in Part IV) – With the 2020 NEC Section 600.7 was rewritten – when determining the maximum voltage of PV system dc circuits. Conductors, equipment, and working space requires the voltage. – Maximum Current. For example, if your PV system has an inverter capable of under 100KW then the maximum current is the sum of the short-circuit current ratings of the PV modules connected in parallel multiplied by 125%. But if the inverter is capable of 100KW or more, then you can use a different method and be documented and stamped (by a licensed PE) PV system design . – If a circuit is protected by an OCPD (over current protective device) not exceeding the conductor ampacity the maximum current value is equal to the rated input current of the electronic power converter input to which it is connected . – Maximum current calculations, in 690.8(C) and 690.8(D). These are “Systems with Multiple Direct-Current Voltages” and “Sizing of Module Interconnection Modules”, respectively. – The overcurrent protection rules are in 690.9. 1- PV system dc circuit and inverter output conductors and equipment must be protected against overcurrent. – Overcurrent protection is not required in some cases, for example where the conductor ampacity is sufficient for the maximum current . Circuits where overcurrent protection is required only at one end . There are “other circuits”, which are those that don’t comply with either of the preceding requirements. Those must be protected by one of the methods listed in 690.9(A)(3). – Any OCPD you use in a PV system must be listed for use in PV systems . – If the PV system is a stand-alone system, install it per the requirements of 710.15 . Article 710 provides the requirements for stand-alone systems. – Arc fault protection is required for any PV system with PV circuits operating at 80 VDC or greater (between any two conductors) . – Any PV system installed in or on a building must have a rapid shutdown function . The reason for it is to protect firefighters. Co-sponsored by: IEEE PES (Power Energy Society) Speaker(s): Mike Brisbois, Nicholas Mechler Agenda: 12:00 pm PDT IEEE Announcements 12:02 pm PDT Introduction of the Speaker 12:04 pm PDT Presentation 12:45 pm PDT Q&A Seattle, Washington, United States, 98121


May 26
12:00 pm - 1:00 pm
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