1805 BAKER AVE 2023-11-28 - Laserfiche WebLink

Conductor, Conduit, and OCPD Sizing Validation 2.Wire, Conduit, and OCPD Code Compliance Validation 1. Maximum System DC Voltage Test 2.1.#1: Branch cables: Microinverter to Transition Box 1.1. Enphase microinverter system w112 Hyundai HIS-S400YH(BK)(40OW)s Circuit Section Properties G. Minimum Required EGC Size 14 AWG see NEC Table 250.122 Conductor 12 AWG THHN/THWN-2 in Enphase Array Properties NEC Code Validation Tests Q Cable,Copper The smallest EGC size allowed is 14 AWG for OCPD rating 15A Arra Type Microinverter Arra Equipment Ground Conductor EGC 6 AWG Bare,Copper according to Table 250.122. PV Source Circuit maximum Voc must not exceed PASS OCPD(s) 15A System Description Enphase microinverter system w112 600V NEC Code Validation Tests Hyundai H HiS-S400YH BK 400W s Raceway/Cable/Cable Cable Hyundai0YH BK 400W 49.07V<600V=true Lowest Terminal Temperature 90°C Module Ratingo Highest number of modules in series 1 OCPD ( e at least 125/o of Continuous PASS Current in a PV Source Circuit Maximum Wire Temperature 49°C (NEC 240,4) Design Low Temp. -6.2°C Power Source Description Branch of 6 IQ8A-72-2-US 15A-8.7A X 1.25=true Module voc 45.3V microinverters Power Source Current 8.7A Derated ampacity must exceed OCPD rating,or PASS Temp.Coefficient voc -0.121V/C Voltage 240V rating of next smaller OCPD(NEC 240.4) 25A-15A(OCPD Rating)=true NEC Code Calculations NEC Code Calculations OCPD rating must not exceed max OCPD rating PASS A. Maximum Voltage of PV Source Circuit 49.07V for conductor(NEC 240.4) see NEC 690.7(A) A. Continuous Current 8.7A 15(OCPD Rating)<-20A =true see NECAdic%100 NEC 690.7(A)requires that if the PV module manufacturer provides a Equipment maximum rated output current is 6 X 145A=8.7A Derated Ampacity must be greater than or equal to PASS qpp . temperature coefficient of open-circuit voltage,it must be used to the Continuous Current(NEC Article 100) calculate the PV array's maximum system voltage.It includes an 25A-8.7A=true information note recommending the use of the ASHRAE'Extreme Annual B.Ampacity of Conductor 30A Mean Minimum Design Dry Bulb Temperature'as the design low see NEC Table 310.16 Conductor Ampacity must be at least 125%of PASS temperature.Using these values,the module Voc(45.3V)will increase to Ampacity(30°C)for a copper conductor with 90°C insulation in Continuous Current(NEC 215.2(A)(1)) 49.07V at the design low temperature(-6.2°C). conduit/cable is 30A. 30A-8.7A x 1.25=true (-6.2°C-25°C)X-0.121V/C+45.3V=49.07V The module Voc at the design low temperature is 49.07V. C. Derated Ampacity Of Conductor 25A • Max current for terminal must beat least 125%of PASS 49.07V X 1=49.07V see NEC 310.15(g)(2),NEC Table 310.15(CJ(1J,andNECAdic%100 the Continuous Current.(NEC 110.14(C)) 30A>=8.7A X 1.25 =true The temperature factor for 90°C insulation at 49°C is 0.82. The fill factor for a conduit/cable that has 2 wires is 1. EGC must meet code requirements for minimum PASS The ampacity derated for Conditions of Use is the product of the size(NEC Table 250.122) conductor ampacity(30A)multiplied by the temperature factor(0.82)and 6 AWG>=14 AWG=true by the fill factor(1). 30A X 0.82 X 1=24.6A rounded to 25A D. Max Current for Terminal Temp. Rating 30A see NEC 110.14(C) The lowest temperature rating for this conductor at any termination is 90°C. Using the method specified in NEC 110.14(C),the maximum current permitted to ensure that the device terminal temperature does not exceed its 90°C rating would be the amount referenced in the 90°C column in NEC Table 310.16,which is 30A. E. Minimum Allowed OCPD Rating 11A see NEC 240.4 NEC 690.9(8)(1)requires OCPD be rated for no less than 1.25 times Continuous Current of the circuit. 8.7A X 1.25=10.88A F. Maximum Allowed OCPD Rating 20A see NEC 240.4(D) NEC 240.4(D)requires that OCPD rating not exceed 20A when protecting a Copper 12 AWG conductor.