|
94 106 130 153 173 192 |
101 115 133 153 178 210 |
119 134 157 183 214 253 |
6 5 4 3 2 1 |
||||
|
1/0 2/0 3/0 4/0 |
190 222 280 300 |
233 267 341 369 |
211 245 305 319 |
259 294 372 399 |
253 303 370 451 |
304 369 452 555 |
1/0 2/0 3/0 4/0 |
|
250 300 350 400 450 500 |
364 455 486 538 600 660 |
420 582 646 688 765 847 |
400 497 542 593 660 726 |
461 636 716 760 836 914 |
510 587 663 742 818 896 |
635 737 837 941 1042 1143 |
250 300 350 400 450 500 |
AMPACITY CORRECTION FACTORS
|
Ambient Temperature (°C) |
For ambient temperatures other than 30°C (86°F), multiply the ampacities shown above by the appropriate factor shown below. |
Ambient Temperature (°F) |
|||||
|
21-25 26-30 31-35 36-40 41^5 46-50 51-55 56-60 61-70 71-80 81-90 91-100 101-120 |
1.05 1.00 0.94 0.88 0.82 0.75 0.67 0.58 0.33 — — — — |
1.05 1.00 0.94 0.88 0.82 0.75 0.67 0.58 0.33 — — — — |
1.04 1.00 0.96 0.91 0.87 0.82 0.76 0.71 0.58 0.41 — — — |
1.04 1.00 0.96 0.91 0.87 0.82 0.76 0.71 0.58 0.41 — — — |
1.02 1.00 0.97 0.95 0.92 0.89 0.86 0.83 0.76 0.69 0.61 0.51 0.40 |
1.02 1.00 0.97 0.95 0.92 0.89 0.86 0.83 0.76 0.69 0.61 0.51 0.40 |
70-77 79-86 88-95 97-104 106-113 115-122 124-131 133-140 142-158 160-176 177-194 195-212 213-248 |
Note: Other insulations shown in Table 310.13(A) and approved for the temperature and location shall be permitted to be substituted for those shown in Table 610.14(A). The allowable ampacities of conductors used with 15-minute motors shall be the 30-minute ratings increased by 12 percent.
1 For 5 to 8 simultaneously energized power conductors in raceway or cable, the ampacity of each power conductor shall be reduced to a value of
80 percent of that shown in this table.
2 For 4 to 6 simultaneously energized 125°C (257°F) ac power conductors in raceway or cable, the ampacity of each power conductor shall be reduced to a value of 80 percent of that shown in this table.
Table 610.14(B) Secondary Conductor Rating
Factors
Time in Seconds Ampacity of Wire in
----------------------------------- Percent of Full-Load
Table 610.14(D) Minimum Contact Conductor Size Based on
Distance Between Supports
On Off Secondary Current
Minimum Size of
Maximum Distance Between End
Strain Insulators or Clamp-Type
5 75 35
10 70 45
15 75 55
15 45 65
15 30 75
15 15 85
Continuous Duty 110
(D) Contact Conductors. Contact wires shall have an ampacity not less than that required by Table 610.14(A) for 75°C (167°F) wire, and in no case shall they be smaller than as shown in Table 610.14(D).
Wire (AWG) Intermediate Supports
6 9.0 m (30 ft) or less
4 18 m (60 ft) or less
2 Over 18 m (60 ft)
(E) Calculation of Motor Load.
(1) Single Motor. For one motor, 100 percent of motor nameplate full-load ampere rating shall be used.
(2) Multiple Motors on Single Crane or Hoist For mul- tiple motors on a single crane or