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NEC LOADS - OPTIONAL CALCULATION: ONE FAMILY DWELLING <br />1 HEATING or AC: 220.82(C)(1-6) <br />Heating Units (3 or less)= VA x 65% 0 VA <br />Heating Units (4 or more)= VA x 40% 0 VA <br />A/C Units = 9600 VA x 100% 9600 VA <br />Heat Pump = VA x 100% 0 VA <br />Largest Load 9600 VA <br />PHASES(Φ) <br />9600 VA <br />2 GENERAL LOADS: 220.82(B)(1-4) <br />General lighting: 220.82(B)(1) <br />2620 sq ft x 3 VA 7860 VA <br />Small Appliance and laundry loads: 220.82(B)(2) <br />1500 VA X 19 circuits = 28500 VA <br />Special loads: 220.82(B)(3-4) <br />Water Heaters = 5760 VA <br />Pool Motor = 7680 VA <br />= VA <br />= VA <br />= VA <br />= VA <br />= VA <br />= VA <br />= VA <br />= VA <br />Subtotal = 13440 VA 13440 VA <br />Total 49800 VA <br />Applying Demand Factors: 220.82(B) <br />First 10,000 Va X 100%= 10000 VA 10000 VA <br />Remaining = 39800 VA X 40% =15920 VA <br />Total 25920 VA 25920 VA <br />PV SYSTEM INTERCONNECTION CALCULATION - "120% RULE" NEC 705.12(D)(2)Total: 35520 VA <br />The Maximum Amperage allowed by NEC into the Main Panel = Main Panel Busbar Rating X 120% <br />175 x 120% = 210 A <br />Therefore, the PV System Breaker + The Main Panel Breaker ratings must be less than 210 A <br />Main Breaker + PV System Breaker ratings: 0 + 150 +40 = 190 A <br />Therefore it is OK to connect the PV System, with a 40 A Breaker, to the Main Panel Busbar <br />The PV System Breaker shall be installed at the opposite side of the Main Panel from the Main Disconnect <br />V = 240 V <br />1Φ Service: <br />Phases = I = <br />VA 148A Which is less than the 150A. Main <br />V <br />2106 N Ridgewood <br />St11/14/22