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Franklin AIM - Page 11


2- or 3-Wire Cable, 60 Hz (Service Entrance to Motor - Maximum Length In Feet)
 
Table 11
Motor Rating 60 °C Insulation - AWG Copper Wire Size
Volts HP KW 14 12 10 8 6 4 3 2 1 0 00 000 0000
115 1/2 .37 100 160 250 390 620 960 1190 1460 1780 2160 2630 3140 3770
230 1/2 .37 400 650 1020 1610 2510 3880 4810 5880 7170 8720      
3/4 .55 300 480 760 1200 1870 2890 3580 4370 5330 6470 7870    
1 .75 250 400 630 990 1540 2380 2960 3610 4410 5360 6520    
1 1/2 1.1 190 310 480 770 1200 1870 2320 2850 3500 4280 5240    
2 1.5 150 250 390 620 970 1530 1910 2360 2930 3620 4480    
3 2.2 120 190 300 470 750 1190 1490 1850 2320 2890 3610    
5 3.7 0 0 180 280 450 710 890 1110 1390 1740 2170 2680  
7 1/2 5.5 0 0 0 200 310 490 610 750 930 1140 1410 1720  
10 7.5 0 0 0 0 250 390 490 600 750 930 1160 1430 1760
15 11 0 0 0 0 170 270 340 430 530 660 820 1020 1260
 
Table 11A
Motor Rating 75 °C Insulation - AWG Copper Wire Size
Volts HP KW 14 12 10 8 6 4 3 2 1 0 00 000 0000
115 1/2 .37 100 160 250 390 620 960 1190 1460 1780 2160 2630 3140 3770
230 1/2 .37 400 650 1020 1610 2510 3880 4810 5880 7170 8720      
3/4 .55 300 480 760 1200 1870 2890 3580 4370 5330 6470 7870 9380  
1 .75 250 400 630 990 1540 2380 2960 3610 4410 5360 6520 7780 9350
1 1/2 1.1 190 310 480 770 1200 1870 2320 2850 3500 4280 5240 6300 7620
2 1.5 150 250 390 620 970 1530 1910 2360 2930 3620 4480 5470 6700
3 2.2 120 190 300 470 750 1190 1490 1850 2320 2890 3610 4470 5550
5 3.7 0 110 180 280 450 710 890 1110 1390 1740 2170 2680 3330
7 1/2 5.5 0 0 120 200 310 490 610 750 930 1140 1410 1720 2100
10 7.5 0 0 0 160 250 390 490 600 750 930 1160 1430 1760
15 11 0 0 0 0 170 270 340 430 530 660 820 1020 1260
1 Foot = .3048 Meter

Lengths in BOLD only meet the US National Electrical Code ampacity requirements for individual conductors 60 °C or 75 °C in free air or water, not in magnetic enclosures, conduit or direct buried.

Lengths NOT in bold meet the NEC ampacity requirements for either individual conductors or jacketed 60 °C or 75 °C cable and can be in conduit or direct buried. Flat molded and web/ribbon cable are considered jacketed cable.

If any other cable is used, the NEC and local codes should be observed.

Cable lengths in Tables 11 & 11A allow for a 5% voltage drop running at maximum nameplate amperes. If 3% voltage drop is desired, multiply Table 11 and 11A lengths by 0.6 to get maximum cable length.

The portion of the total cable length, which is between the supply and single-phase control box with a line contactor, should not exceed 25% of total maximum allowable to ensure reliable contactor operation. Single-Phase control boxes without line contactors may be connected at any point in the total cable length.

Tables 11 & 11A is based on copper wire. If aluminum wire is used, it must be two sizes larger than copper wire and oxidation inhibitors must be used on connections.

EXAMPLE: If Table 11 & 11A call for #12 copper wire, #10 aluminum wire would be required.

Contact Franklin Electric for 90 °C cable lengths. See pages 15, 48, and 49 for applications using 230 V motors on 208 V power systems.