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2.2.#2:AC Branch Output:Transition Box to AC Combiner 2.3.#3:AC Combiner Output:AC Combiner to subpanel Circuit Section Properties G. Minimum Required EGC Size 14 AWG Circuit Section Properties F. Minimum Required EGC Size 10 AWG see NEC Table 250.122 see NEC Table 250.122 and NEC 690.45 Conductor 12 AWG THWN-2 Copper Conductor 8 AWG THWN-2 Copper Equipment Ground Conductor EGC 12 AWG THWN-2,Copper The smallest EGC size allowed is 14 AWG for OCPD rating 15A Equipment Ground Conductor EGC 10 AWG THWN-2 Copper The smallest EGC size allowed is 10 AWG for OCPD rating 25A OCPD(s) 15A OCPD(s) 25A according to Table 250.122. according to Table 250.122. Raceway/Cable 0.75"dia.EMT Raceway/Cable 0.75"dia.EMT According to NEC 690.45,it is not necessary to increase the size of the Lowest Terminal Temperature 75°C Lowest Terminal Temperature 75°C H. Minimum Recommended Conduit Size 0.5"dia. PV array's EGC when conductors are oversized for voltage drop Rating see NEC 300.17 Rating considerations. Maximum Wire Temperature 27°C The total area of all conductors is 0.0399in'.With a maximum fill rate of Maximum Wire Temperature 27°C Power Source Description Branch of 6 IQ8A-72-2-US 0.4,the recommended conduit diameter is 0.5. Power Source Description Enphase microinverter system w/12 G. Minimum Recommended Conduit Size 0.5„dia. microinverters Hyundai HiS-S400YH BK 400W s see NEC 300.17 Power Source Current 8.7A 2L Description Size Type Area Total Area Power Source Current 17.4A The total area of all conductors is 0.0943in2.With a maximum fill rate of Volta e 240V 2 Conductor 12 AWG THWN-2 0.0133inz 0.0266inz Voltage 240V 0.4,the recommended conduit diameter is 0.5. NEC Code Calculations 1 Equipment Ground 12 AWG THWN-2 0.0133in2 0.0133in2 NEC Code Calculations LtL Description Size Type Area Total Area 3 0.0399in2 2 Conductor 8 AWG THWN-2 0.0366inz 0.0732in2 A. Continuous Current 8.7A 0.0399in2/0.4=0.0998in2(Corresponding to a diameter of 0.5") A. Continuous Current 17.4A 1 Equipment Ground 10 AWG THWN-2 0.0211in2 0.0211in2 see NECArtide 100 see NECArtide 100 3 0.0943in2 Equipment maximum rated output current is 6 X 1.45A=8.7A NEC Code Validation Tests Equipment maximum rated output current is 17AA 2 0.0943in z 10.4=0.2358in (Corresponding to a diameter of 0.5") OCPD rating must be at least 125%of Continuous PASS B.Ampacity of Conductor 30A Current(NEC 240.4) B.Ampacity of Conductor 55A NEC Code Validation Tests see NEC Table 310.16 15A-8.7A X 1.25=true see NEC Table 310.16 Ampacity(30°C)for a copper conductor with 90°C insulation in Ampacity(30°C)for a copper conductor with 90°C insulation in OCPD rating must be at least 125%of Continuous PASS conduit/cable is 30A. Derated ampacity must exceed OCPD rating,or PASS conduit/cable is 55A. Current(NEC 240.4) rating of next smaller OCPD(NEC 240.4) 25A-17AA X 1.25=true C. Derated Ampacity of Conductor 30A 30A-15A(OCPD Rating)=true C. Derated Ampacity of Conductor 55A p y p y Derated ampacity must exceed OCPD rating,or PASS see NEC 310 15(8)(2),NEC Table 310.15(C)(f),andNECArfic%100 OCPD rating must not exceed max OCPD rating PASS see NEC 310 15(g)(2),NEC Table 310.15(C)(1),and NEC Artic%100 rating of next smaller OCPD(NEC 240.4) The temperature factor for 90°C insulation at 27°C is 1. for conductor(NEC 240.4) The temperature factor for 90°C insulation at 27°C is 1. 55A-25A(OCPD Rating)=true The fill factor for a conduit/cable that has 2 wires is 1. 15(OCPD Rating)-20A =true The fill factor for a conduit/cable that has 2 wires is 1. The ampacity derated for Conditions of Use is the product of the The ampacity derated for Conditions of Use is the product of the Derated Ampacity must be greater than or equal to PASS conductor ampacity(30A)multiplied by the temperature factor(1)and by Derated Ampacity must be greater than or equal to PASS conductor ampacity(55A)multiplied by the temperature factor(1)and by the Continuous Current(NEC Article 100) the fill factor(1). the Continuous Current(NEC Article 100) the fill factor(1). 55A-17AA=true 30A X 1 X 1=30.OA 30A-8.7A=true 55A X 1 X 1=55.OA Conductor Ampacity must be at least 125%of PASS D. Max Current for Terminal Temp. Rating 25A Conductor Ampacity must be at least 125%of PASS D. Max Current for Terminal Temp. Rating 50A Continuous Current(NEC 215.2(A)(1)) p 9 Continuous Current(NEC 215.2(A)(1)) p g 55A-17.4A x 1.25=true see NEC 1 f14(C) see NEC f 10.14(C) 30A>=87A x 1.25=true The lowest temperature rating for this conductor at any termination is The lowest temperature rating for this conductor at any termination is Max current for terminal must be at least 125%of PASS 75°C Max current for terminal must be at least 125%of PASS 75°C the Continuous Current.(NEC 110.14(C)) Using the method specified in NEC 110.14(C),the maximum current the Continuous Current.(NEC 110.14(C)) Using the method specified in NEC 110.14(C),the maximum current 50A-17AA X 1.25 =true permitted to ensure that the device terminal temperature does not exceed 25A-8.7A X 1.25 =true permitted to ensure that the device terminal temperature does not exceed its 75°C rating would be the amount referenced in the 75°C column in its 75°C rating would be the amount referenced in the 75°C column in EGC must meet code requirements for minimum PASS NEC Table 310.16,which is 25A. EGC must meet code requirements for minimum PASS NEC Table 310.16,which is 50A. size(NEC Table 250.122) size(NEC Table 250.122) 10 AWG-10 AWG=true 12 AWG-14 AWG=true E. Minimum Allowed OCPD Rating 22A 11 A Conduit must meet code recommendation for PASS see NEC 240.4 Conduit must meet code recommendation for PASS see NEC 240.4 E. Minimum Allowed OCPD Rating minimum size(NEC 300.17) NEC 690.9(B)(1)requires OCPD be rated for no less than 1.25 times minimum size(NEC 300.17) NEC 690.9(B)(1)requires OCPD be rated for no less than 1.25 times 0.75in.-0.5in.=true Continuous Current of the circuit. 0.75in.-0.5in.=true Continuous Current of the circuit. 8.7A X 1.25=10.88A 17AA X 1.25=21.75A 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.