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Cable Size Calculations

File: 52885634.xls, Sheet: Calculations 1 of 4 Print Date: 03/05/2011

Calculations Based On Motor HP

Input Data Calculated Values

Motor Voltage (V L-L) Operating Current (A) 7.6

Motor HP 125% Current per NEC (A) 9.5

Cable Temperature Rating (C) "Zero Length" Cable Size 14 AWG

Ambient Temperature (C) Acceptable Voltage Drop (V) 7.97

Cable Length (ft) 500 Recommended Cable Size 12 AWG

Acceptable Voltage Drop (%) 3.0% Actual Voltage Drop (V) 6.46

Actual Voltage Drop (%) 2.4%

Calculations Based On Specified Current

Input Data Calculated Values

Operating Voltage (V L-L) 460 "Zero Length" Cable Size 14 AWG

Specified Current (A) 7.6 Acceptable Voltage Drop (V) 7.97

Cable Temperature Rating (C) Recommended Cable Size 12 AWG

Ambient Temperature (C) Actual Voltage Drop (V) 6.46

Cable Length (ft) 500 Actual Voltage Drop (%) 2.4%

Acceptable Voltage Drop (%) 3.0%

460

5.00

75

26-30 (s td)

75

26-30 (s td)

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File: 52885634.xls, Sheet: Motor Table 2 of 4 Print Date: 03/05/2011

Rated Currents Vs. HP and Voltage

VoltageHP 208 230 460 575

0.50 2.4 2.2 1.1 0.90.75 3.5 3.2 1.6 1.31.00 4.6 4.2 2.1 1.71.50 6.6 6 3 2.42.00 7.5 6.8 3.4 2.73.00 10.6 9.6 4.8 3.95.00 16.7 15.2 7.6 6.17.50 24.2 22 11 9

10.00 30.8 28 14 1115.00 46.2 42 21 1720.00 59.4 54 27 2225.00 74.8 68 34 2730.00 88 80 40 3240.00 114 104 52 4150.00 143 130 65 5260.00 169 154 77 6275.00 211 192 96 77

100.00 273 248 124 99125.00 343 312 156 125150.00 396 360 180 144200.00 528 480 240 192250.00 #N/A #N/A 302 242300.00 #N/A #N/A 361 289350.00 #N/A #N/A 414 336400.00 #N/A #N/A 477 382450.00 #N/A #N/A 515 412500.00 #N/A #N/A 590 472

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File: 52885634.xls, Sheet: Conductor Tables 3 of 4 Print Date: 03/05/2011

AWG or kcmil 75 90 4 x 350 1240 1240.0 1240.0 1400 1400.0 1400.03 x 500 1140 1140.0 1140.0 1290 1290.0 1290.04 x 250 1020 1020.0 1020.0 1160 1160.0 1160.03 x 350 930 930.0 930.0 1050 1050.0 1050.02 x 500 760 760.0 760.0 860 860.0 860.03 x 4/0 690 690.0 690.0 780 780.0 780.02 x 350 620 620.0 620.0 700 700.0 700.02 x 250 510 510.0 510.0 580 580.0 580.02 x 4/0 460 460.0 460.0 520 520.0 520.0

500 380 380.0 380.0 430 430.0 430.0350 310 310.0 310.0 350 350.0 350.0250 255 255.0 255.0 290 290.0 290.04/0 230 230.0 230.0 260 260.0 260.03/0 200 200.0 200.0 225 225.0 225.02/0 175 175.0 175.0 195 195.0 195.01/0 150 150.0 150.0 170 170.0 170.01 130 130.0 130.0 150 150.0 150.02 115 115.0 115.0 130 130.0 130.04 85 85.0 85.0 95 95.0 95.06 65 65.0 65.0 75 75.0 75.08 50 50.0 50.0 55 55.0 55.0

10 35 35.0 35.0 40 40.0 40.012 25 25.0 25.0 30 30.0 30.014 20 20.0 20.0 25 25.0 25.0

Applied De-rate factor 1.00 1.00 1.00 1.00

De-rate factors 75 9021-25 1.05 1.04

26-30 (std) 1.00 1.0031-35 0.94 0.9636-40 0.88 0.9141-45 0.82 0.8746-50 0.75 0.8251-55 0.67 0.76

Cable Ampacity (Table 310-16)

Motor HP with

75 De-rate

Specified Current

with75 De-rate

Motor HP with

90 De-rate

Specified Current

with90 De-rate

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File: 52885634.xls, Sheet: Conductor Tables 4 of 4 Print Date: 03/05/2011

AWG or kcmil Label 4 x 350 0.0150 0.06 0.06 kcmil3 x 500 0.0167 0.06 0.06 kcmil4 x 250 0.0183 0.07 0.07 kcmil3 x 350 0.0200 0.08 0.08 kcmil2 x 500 0.0250 0.10 0.10 kcmil3 x 4/0 0.0267 0.10 0.10 AWG2 x 350 0.0300 0.11 0.11 kcmil2 x 250 0.0365 0.14 0.14 kcmil2 x 4/0 0.0400 0.15 0.15 AWG

500 0.0500 0.19 0.19 kcmil350 0.0600 0.23 0.23 kcmil250 0.0730 0.28 0.28 kcmil4/0 0.0800 0.30 0.30 AWG3/0 0.0940 0.36 0.36 AWG2/0 0.1100 0.42 0.42 AWG1/0 0.1300 0.49 0.49 AWG1 0.1600 0.61 0.61 AWG2 0.2000 0.76 0.76 AWG4 0.3000 1.14 1.14 AWG6 0.4500 1.71 1.71 AWG8 0.7000 2.66 2.66 AWG

10 1.1000 4.18 4.18 AWG12 1.7000 6.46 6.46 AWG14 2.7000 10.26 10.26 AWG

60Hz Impedanceper 1000 ft

Voltage DropBased OnMotor HP

Voltage DropBased OnOperating

Current