4609 W El Don Pl - Plan - Laserfiche WebLink

Home Browse Search

Conductor, Conduit, and OCPD Sizing Validation 1. Maximum System DC Voltage Test 1.1. Enphase inverter w/6 Ureco FAM440E8G-BB (440W)s Array Properties Array Type Microinverter Array System Description Enphase inverter w/6 Ureco FAM440E8G-BB (440W)s Module FAM440E8G-BB (440W) Highest number of modules in series in a PV Source Circuit 1 Design Low Temp.3.3°C Module voc 49.6V Temp. Coefficient voc -0.134V/C CEC Code Calculations A. Maximum Voltage of PV Source Circuit 52.51V see 690.7(A) CEC 690.7(A) requires that if the PV module manufacturer provides a temperature coefficient of open-circuit voltage, it must be used to calculate the PV array's maximum system voltage. It includes an information note recommending the use of the ASHRAE 'Extreme Annual Mean Minimum Design Dry Bulb Temperature' as the design low temperature. Using these values, the module Voc (49.6V) will increase to 52.51V at the design low temperature ( 3.3°C). (3.3°C - 25°C) X -0.134V/C + 49.6V = 52.51V The module Voc at the design low temperature is 52.51V. 52.51V X 1 = 52.51V CEC Code Validation Tests 1. PV Source Circuit maximum Voc must not exceed 600V 52.51V < 600V = true PASS 2. Wire, Conduit, and OCPD Code Compliance Validation 2.1. #1: AC Branch Output: Transition Box to AC Disconnect Circuit Section Properties Conductor 12 AWG THWN-2, Copper Equipment Ground Conductor (EGC) 12 AWG THWN-2, Copper OCPD(s) 10A Raceway/Cable 0.5" dia. EMT Lowest Terminal Temperature Rating 75°C Maximum Wire Temperature 52°C Power Source Description Branch of 6 IQ8PLUS-72-2-US microinverters Power Source Current 7.26A Voltage 240V CEC Code Calculations A. Continuous Current 7.26A see Article 100 Equipment maximum rated output current is 6 X 1.21A = 7.26A B. Ampacity of Conductor 30A see Table 310.15(B)(16) Ampacity (30°C) for a copper conductor with 90°C insulation in conduit/cable is 30A. C. Derated Ampacity of Conductor 23A see Table 310.15(B)(3)(c), Table 310.15(B)(3)(a), and Article 100 The temperature factor for 90°C insulation at 52°C is 0.76. 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 conductor ampacity (30A) multiplied by the temperature factor (0.76) and by the fill factor (1). 30A X 0.76 X 1 = 22.8A rounded to 23A D. Max Current for Terminal Temp. Rating 25A see 110.14(C) The lowest temperature rating for this conductor at any termination is 75°C. Using the method specified in 110.14(C), the maximum current 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 Table 310.15(B)(16), which is 25A. E. Minimum Allowed OCPD Rating 9A see 240.4 CEC 690.9(B) requires that the OCPD be rated for no less than 1.25 times the Continuous Current of the circuit. 7.26A X 1.25 = 9.07A rounded down to 9A F. Maximum Allowed OCPD Rating 20A see 240.4(D) CEC 240.4(D) requires that OCPD rating not exceed 20A when protecting a Copper 12 AWG conductor. G. Minimum Required EGC Size 14 AWG see Table 250.122 The smallest EGC size allowed is 14 AWG for OCPD rating 10A according to Table 250.122. H. Minimum Recommended Conduit Size 0.5" dia. see 300.17 The total area of all conductors is 0.0765in². With a maximum fill rate of 0.4, the recommended conduit diameter is 0.5. Qty Description Size Type Area Total Area 2 Conductor 12 AWG THWN-2 0.0133in² 0.0266in² 1 Neutral 8 AWG THWN-2 0.0366in² 0.0366in² 1 Equipment Ground 12 AWG THWN-2 0.0133in² 0.0133in² 4 0.0765in² 0.0765in² / 0.4 = 0.1913in² (Corresponding to a diameter of 0.5") CEC Code Validation Tests 1.OCPD rating must be at least 125% of Continuous Current (240.4) 10 >= 7.26A X 1.25 = true PASS 2.Derated ampacity must exceed OCPD rating, or rating of next smaller OCPD (240.4) 23A >= 10A (OCPD Rating) = true PASS 3.OCPD rating must not exceed max OCPD rating for conductor (240.4) 10 (OCPD Rating) <= 20A = true PASS 4.Derated Ampacity must be greater than or equal to the Continuous Current (Article 100) 23A >= 7.26A = true PASS 5.Conductor Ampacity must be at least 125% of Continuous Current (215.2(A)(1)) 30A > 7.26A x 1.25 = true PASS 6.Max current for terminal must be at least 125% of the Continuous Current. (110.14(C)) 25A >= 7.26A X 1.25 = true PASS 7.EGC must meet code requirements for minimum size (Table 250.122) 12 AWG >= 14 AWG = true PASS 8. Conduit must meet code recommendation for minimum size (300.17) 0.5in. >= 0.5in. = true PASS 4609 W El Don Pl - 10111143409/21/22