2332 N Spurgeon St - Plan - Laserfiche WebLink

Home Browse Search

2.2. #2: DC Source Circuit: Transition Box to Inverter Circuit Section Properties Conductor 10 AWG THWN-2, Copper Equipment Ground Conductor (EGC) 8 AWG THWN-2, Copper OCPD(s) N/A Raceway/Cable 0.75" dia. EMT Lowest Terminal Temperature Rating 90°C Maximum Wire Temperature 33°C Power Source Description DC-to-DC converter source circuit consisting of 12 Solar Edge S440 optimizers. Power Source Current 15A Voltage 400V CEC Code Calculations A. Continuous Current 15A see CEC 690.8(A)(1)(d) The continuous current of this DC-DC converter source circuit is equal to the rated maximum output current of the optimizer. Rated Max. Output Current of optimizer is 15A B. Ampacity of Conductor 40A see CEC Table 310.15(B)(16) Ampacity (30°C) for a copper conductor with 90°C insulation in conduit/cable is 40A. C. Derated Ampacity of Conductor 38.4A see CEC Table 310.15(B)(3)(c), CEC Table 310.15(B)(3)(a), and CEC Article 100 The temperature factor for 90°C insulation at 33°C is 0.96. 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 (40A) multiplied by the temperature factor (0.96) and by the fill factor (1). 40A X 0.96 X 1 = 38.4A D. Max Current for Terminal Temp. Rating 40A see CEC 110.14(C) The lowest temperature rating for this conductor at any termination is 90°C. Using the method specified in CEC 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 CEC Table 310.15(B)(16), which is 40A. E. Minimum Required EGC Size 12 AWG see CEC Table 250.122 and CEC 690.45 The smallest EGC size allowed is 12 AWG for OCPD rating 20A according to Table 250.122. According to CEC 690.45, it is not necessary to increase the size of the PV array's EGC when conductors are oversized for voltage drop considerations. F. Minimum Recommended Conduit Size 0.5" dia. see CEC 300.17 The total area of all conductors is 0.0788in². With a maximum fill rate of 0.4, the recommended conduit diameter is 0.5. Qty Description Size Type Area Total Area 2 Conductor 10 AWG THWN-2 0.0211in² 0.0422in² 1 Equipment Ground 8 AWG THWN-2 0.0366in² 0.0366in² 3 0.0788in² 0.0788in² / 0.4 = 0.197in² (Corresponding to a diameter of 0.5") CEC Code Validation Tests 1. Derated Ampacity must be greater than or equal to the Continuous Current (CEC Article 100) 38.4A >= 15A = true PASS 2.Conductor Ampacity must be at least 125% of Continuous Current (CEC 215.2(A)(1)) 40A > 15A x 1.25 = true PASS 3.Max current for terminal must be at least 125% of the Continuous Current. (CEC 110.14(C)) 40A >= 15A X 1.25 = true PASS 4.EGC must meet code requirements for minimum size (CEC Table 250.122) 8 AWG >= 12 AWG = true PASS 5. Conduit must meet code recommendation for minimum size (CEC 300.17) 0.75in. >= 0.5in. = true PASS 2.3. #3: Inverter Output: Inverter to Utility Disconnect Circuit Section Properties Conductor 8 AWG THWN-2, Copper Equipment Ground Conductor (EGC) 8 AWG THWN-2, Copper OCPD(s) 40A Raceway/Cable 0.75" dia. EMT Lowest Terminal Temperature Rating 75°C Maximum Wire Temperature 33°C Power Source Description 7600W Inverter Power Source Current 32A Voltage 240V Inverter Max OCPD rating No Data CEC Code Calculations A. Continuous Current 32A see CEC Article 100 Equipment maximum rated output current is 1 X 30A = 32A B. Ampacity of Conductor 55A see CEC Table 310.15(B)(16) Ampacity (30°C) for a copper conductor with 90°C insulation in conduit/cable is 55A. C. Derated Ampacity of Conductor 53A see CEC Table 310.15(B)(3)(c), CEC Table 310.15(B)(3)(a), and CEC Article 100 The temperature factor for 90°C insulation at 33°C is 0.96. 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 (55A) multiplied by the temperature factor (0.96) and by the fill factor (1). 55A X 0.96 X 1 = 52.8A rounded to 53A D. Max Current for Terminal Temp. Rating 50A see CEC 110.14(C) The lowest temperature rating for this conductor at any termination is 75°C. Using the method specified in CEC 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 CEC Table 310.15(B)(16), which is 50A. E. Minimum Allowed OCPD Rating 40A see CEC 240.4 CEC 690.9(B) requires OCPD be rated for no less than 1.25 times Continuous Current of the circuit. 32A X 1.25 = 40A F. Minimum Required EGC Size 10 AWG see CEC Table 250.122 The smallest EGC size allowed is 10 AWG for OCPD rating 40A according to Table 250.122. G. Minimum Recommended Conduit Size 0.75" dia. see CEC 300.17 The total area of all conductors is 0.1464in². With a maximum fill rate of 0.4, the recommended conduit diameter is 0.75. Qty Description Size Type Area Total Area 2 Conductor 8 AWG THWN-2 0.0366in² 0.0732in² 1 Neutral 8 AWG THWN-2 0.0366in² 0.0366in² 1 Equipment Ground 8 AWG THWN-2 0.0366in² 0.0366in² 4 0.1464in² 0.1464in² / 0.4 = 0.366in² (Corresponding to a diameter of 0.75") CEC Code Validation Tests 1.OCPD rating must be at least 125% of Continuous Current (CEC 240.4) 40A >= 32A X 1.25 = true PASS 2.Derated ampacity must exceed OCPD rating, or rating of next smaller OCPD (CEC 240.4) 53A >= 40A (OCPD Rating) = true PASS 3.Derated Ampacity must be greater than or equal to the Continuous Current (CEC Article 100) 53A >= 32A = true PASS 4. Conductor Ampacity must be at least 125% of Continuous Current (CEC 215.2(A)(1)) 55A > 32A x 1.25 = true PASS 5.Max current for terminal must be at least 125% of the Continuous Current. (CEC 110.14(C)) 50A >= 32A X 1.25 = true PASS 6.EGC must meet code requirements for minimum size (CEC Table 250.122) 8 AWG >= 10 AWG = true PASS 7.Conduit must meet code recommendation for minimum size (CEC 300.17) 0.75in. >= 0.75in. = true PASS 2332 N Spurgeon St05/30/23