Laserfiche WebLink
EVERETT TRANSIT OPERATIONS CENTER 3225 CEDAR ST. EVERETT,WA 98208 <br /> LOAD CALCULATIONS FOR"PANEL 2NN1" <br /> BASED ON THE 2023 NEC NEC 220.61(A) <br /> L1 L2 L3 NEUTRAL' <br /> CALCULATED LOAD(NEC 215.5) 11,500 VA 10,960 VA 6,215 VA 0 VA <br /> CALCULATED LOAD WITH DEMAND FACTORS(NEC 215.5) <br /> GENERAL LOAD 60 VA 120 VA 95 VA <br /> RECEPTACLE LOAD(NEC TABLE 220.44) <br /> 1ST 10,000W 2,960 VA 2,360 VA 2,580 VA <br /> CONTINUOUS LOAD(NEC 215.2) 7,280 VA 7,280 VA 0 VA <br /> PLUS 25%(1-1,L2,L3) 1,820 VA 1,820 VA 0 VA <br /> MOTOR LOAD(NEC 430.24) 1,200 VA 1,200 VA 0 VA <br /> PLUS 25%OF LARGEST MOTOR 300 VA 300 VA 0 VA <br /> KITCHEN LOADS(NEC 220.56) <br /> L1 (OX1 )= 0 VA <br /> L2(OX1 )= OVA <br /> L3(3,540 X 1 )= 3,540 VA <br /> TOTAL BALANCED LOAD(3-PHASE) 6,215 VA 6,215 VA 6,215 VA <br /> TOTAL BALANCED LOAD(1-PHASE) 6,865 VA 6,865 VA 0 VA <br /> TOTAL UNBALANCED LOAD(1-PHASE) 540 VA 0 VA 0 VA <br /> NEUTRAL LOAD 0 VA <br /> LINE AMPS BALANCED(3-PHASE) 51.8 A 51.8 A 51.8 A <br /> LINE AMPS BALANCED(1-PHASE) 66.0 A 66.0 A 0.0 A <br /> LINE AMPS UNBALANCED(1-PHASE) 4.5 A 0.0 A 0.0 A <br /> TOTALS 122.3 A 117.8 A 51.8 A 0.0 A <br /> ADJUSTMENT FACTOR 0.0 A 0.0 A 0.0 A 0.0 A <br /> TOTAL DESIGN LOAD 122.3 A 117.8 A 51.8 A 0.0 A <br /> VOLTAGE DROP CALCULATIONS <br /> Three Phase Primary (2 X 15'L X 0.4910 R X 53.0 A_1,000 X 0.866) =0.7 VD <br /> Voltage Drop%Primary (0.7 VD_480 V X 100)=0.2%VD <br /> Three Phase Secondary (2 X 20'L X 0.1540 R X 122.3 A_1,000 X 0.866) =0.7 VD <br /> Voltage Drop%Secondary (0.7 VD_208 V X 100)=0.3%VD <br /> HARMONIC CURRENT CALCULATION(NEC 310.15(B)4(C)&NEC TABLE 310.15 B(2)A) <br /> (Harmonic Load 0 VA_Connected Load 28,675 VA)X 100=0% <br /> Harmonic Load Does Not Exceed 50% <br /> PRIMARY FAULT CURRENT CALCULATIONS <br /> Available Fault Current at Starting Point ((25,954 AFC X 1.00 UA)+12 MC)=25,966 AFC <br /> Conductor Factor CF-Formula(1.732 X 15 L X 25,966 AFC )_(2,425 C X 1 N X 480 PV)=0.580 CF <br /> Conductor Multiplier CM-Formula (1 )_(1 +0.580 CF)=0.633 CM <br /> Conductor Let-Through Current CLC-Formula(25,966 AFC X 0.633 CM)=16,436 CLC <br /> TRANSFORMER LET THROUGH CURRENT CALCULATIONS <br /> Calculate TF(16,436 AFC x 480 PV x 1.732 x 2.5%Z)_(100,000 x 45.0 KVA)=7.591 TF <br /> Calculate TM(1 )/(1 +7.591 TF)=0.116 TM <br /> Calculate TLC((((480 PV_208 SV)_(0.116 TM x 16,436 AFC))x 1.0 UA)+28 MC)=4,428 TLC <br /> SECONDARY FAULT CURRENT CALCULATIONS <br /> Conductor Factor CF-Formula(1.732 x 20 L x 4,428 TLC)+(7,293 C x 1 N x 208 SV)=0.101 CF <br /> Conductor Multiplier CM-Formula (1 )+(1 +0.101 CF)=0.908 CM <br /> Conductor Let-Through Current CLC-Formula(4,428 TLC x 0.908 CM)=4,020 CLC <br /> %Z-Transformer Impedance Nameplate%Z L-Length of Conductor TM-Transformer Multiplier <br /> A-Amps MC-Motor Contribution UA-Utility Adjustment 1.1 <br /> AFC-Available Fault Current N-Number of Conductors Per Phase V-Voltage <br /> C-Conductor Constant PV-Primary Voltage VA-Volt Amps <br /> CF-Conductor Factor R-Resistance VD-Voltage Drop <br /> CLC-Conductor Let-Through Current SV-Secondary Voltage <br /> CM-Conductor Multiplier TF-Transformer Factor <br /> KVA-Kilovolt Amps TLC-Transformer Let-Through Current <br /> Prepared With 1-Line 2023 Software-Copyright Durand&Associates-www.durandassociates.com <br />