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D. Electrical Calculations <br />1. PV Circuit current <br />PV circuit nominal current <br />Cont:inuous cur cn[ adjustment factor <br />PV circuit cori[inuous current rating <br />15.3 amps <br />125% <br />19.125 a.[Aps <br />-2013 CEC Article 705.60(B)) <br />2. Overcurrent protection deviice rating <br />PV Circuit continuous current ra[ihg <br />Next standard size fuse/breaker ro protect conductors <br />19.125 mnps <br />20 amp breaker <br />Use 20 amp AC rated fuseior breaker <br />3.Conductor conditions of use adjustment (conductor ampacity der:[te) <br />a. Temperature adder <br />Average high temperature 40.9 °C (105.62 °F) <br />Coriduit is installed 1" above the roof surface Add 22 °C to iambient <br />Adjusted maximum: ambient temperature 62.9 °C (145.22°F) <br />2013 CE€ Table 310.15(B)(2)(a) <br />b. PV Circuit current adjustment for new ambient temperature <br />Derate factor for 62.9 'C 045.22°P)58% <br />Adjusted PV circuit Cononuous current 32.9 amps <br />2013 CE(.Table 310. 16 (60:lom of table) <br />c. PV Circuit current adjustment for conduit fill <br />Number of current-carrying conductors <br />Conduit fill derate factor <br />Final Adjusted PV circuit conliriuous current <br />3 conductors <br />100% <br />32.9 anips <br />2013 CEC Table 310.15(Bj,2)04 <br />Total derated ampacity for PV circuit 32.9 amps <br />Conductors (tag2 on 1-line) must be rated for a minimum of 32.9 amps <br />THWN-2 (90 °C) #10.AWG conductor is rated' for 40 amps (Use #10AWG or larger)2013.CE€£ Table.310.16 <br />4. Voltage drop (keep below 3% total) <br />2.Barts: <br />1. Volm* drop'across longest PV circuit micid-inverters (from hiedules to j-box) <br />2. Voltage drop across AC conductors (frorn j-box to point of intertennection) <br />1. Mirco-inveitet voltage drop: <br />The. larges[: number of micrb-inverters in a row in d·ic entire array is 5 inCircuit l. According to <br />manufacturer's specificadons this 'equals a vokage drop o f 0.13 %. <br />0.13% <br />2. AC conducrer veltage drop: <br />= Ix R*D (+ 240 x |00 to convert to perceft¢ <br />= (Nominal cur unr oF larges i cir·cuir) x Jiesist:ince of# 10AWG copper) x (Toral wire run) <br />= (Circuit 1 nominal current is 1 5.3 :imps) x (0.0012662>x (2002 + (240 volis) x ·(100)1.6% <br />Total system voltage drop:1.73% <br />9090030.