TABLE OF CONTENTS | Single-phase VD = A ft 2K/C.M. | |
| Three-phase VD = A ft 2K 0.866/C.M. | |
| Three-phase VD = A ft 2K 0.866 1.5/C.M.( for two pole systems) | |
| where A = amperes | |
| L = | distance from source of supply to load |
| C.M. = | cross-sectional area of conductor in circular mills: |
| K = | 12 for copper more than 50 percent loading |
| K = | 11 for copper less than 50 percent loading |
| K = | 18 for aluminum |
| VOLTAGE DROP CALCULATION FOR COPPER WIRES | ||||
|---|---|---|---|---|
| WIRE | THHN AMPACITY | THWN AMPACITY | MCM | CONDUIT DIAMETER (IN) |
| 2,000 | 2,016,252 | |||
| 1,750 | 1,738,503 | |||
| 1,500 | 1,490,944 | |||
| 1,250 | 1,245,699 | |||
| 1,000 | 615 | 545 | 999,424 | |
| 900 | 595 | 520 | 907,924 | |
| 800 | 565 | 490 | 792,756 | |
| 750 | 535 | 475 | 751,581 | |
| 700 | 520 | 460 | 698,389 | 4 |
| 600 | 475 | 420 | 597,861 | 4 |
| 500 | 430 | 380 | 497,872 | 4 |
| 400 | 380 | 335 | 400,192 | 4 |
| 350 | 350 | 310 | 348,133 | 3 |
| 300 | 320 | 285 | 299,700 | 3 |
| 250 | 290 | 255 | 248,788 | 3 |
| 4/0 | 260 | 230 | 211,600 | 2 |
| 3/0 | 225 | 200 | 167,000 | 2 |
| 2/0 | 195 | 175 | 133,100 | 2 |
| 1/0 | 170 | 150 | 105,600 | 2 |
| 1 | 150 | 130 | 83,690 | 1 |
| 2 | 130 | 115 | 66,360 | 1 |
| 3 | 110 | 100 | 52,620 | 1 |
| 4 | 95 | 85 | 41,740 | 1 |
| 6 | 75 | 65 | 26,240 | 1 |
| 8 | 55 | 50 | 15,510 |
|
| 10 | 30 | 30 | 10,380 |
|
| 12 | 20 | 20 | 6,530 |
|
| 24NEC ALLOWED CABLE DISTANCES FOR0240 VOLT AC OR DC CABLE-CHART... |
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