|
 TYPICAL
INSTALLATIONS UNDERGROUND
IN DUCTS
|
Single
Conductors
| Assumptions:
Ambient Temperature 20°C
Conductor Temperature 90°C
Earth RHO 90°C - cm/watt
Concrete RHO 85°C
- cm/watt
Duct RHO 600°C - cm/watt
No Sheath Losses (Single point grounding)
5 Inch Duct
Surface Limit 45°C (Direct Buried)
* NOTE: Cable surface temperature
limit may reduce conductor operating temperature.
|
|
Three
Conductors
Paralleled/Triplexed or
One-Three
Conductor Cable
|
TYPICAL
INSTALLATIONS IN AIR
Assumptions:
Ambient Temperature Indoor 40°C - Outdoor 35°C
Conductor Temperature 90°C
Surface Emissivity 0.85
No Sheath Losses
Additional Outdoor Conditions
Surface Absorptivity 0.33
Atmospheric Pressure 1 atm
Air Speed 4 ft./sec.
Derating
Factors for Cables in Air
Separated by
1/4
to 1 Cable Diameters
No.
of Cables
Vertically |
No.
of Cables Horizontally |
| 1 |
2 |
3 |
4 |
5 |
6 |
| 2 |
0.89 |
0.83 |
0.79 |
0.76 |
0.75 |
0.74 |
| 3 |
0.80 |
0.76 |
0.72 |
0.70 |
0.69 |
0.68 |
| 4 |
0.77 |
0.72 |
0.68 |
0.67 |
0.66 |
0.65 |
| 5 |
0.75 |
0.70 |
0.66 |
0.65 |
0.64 |
0.63 |
| 6 |
0.74 |
0.69 |
0.64 |
0.63 |
0.62 |
0.61 |
Derating
Factors for Cables in Air
One Layer of Spaced Cables in a Horizontal Line
| Separation
of Cable Surfaces |
Derating
Factors |
| S |
Ka |
| 0" |
0.840 |
| 1" |
0.890 |
| 2" |
0.920 |
| 4" |
0.960 |
| 6" |
0.980 |
| 8" |
0.990 |
| 10" |
1.00 |
Derating
Factors for Cables in Conduits in Air Separated
by
1/4 to 1 Conduit Diameters
No.
of Conduits
Vertically |
No.
of Conduit Horizontally |
| 1
|
2
|
3
|
4
|
5
|
6
|
| 1
|
1.00
|
0.94
|
0.91
|
0.88
|
0.87
|
0.86
|
| 2
|
0.92
|
0.87
|
0.84
|
0.81
|
0.80
|
0.79
|
| 3
|
0.85
|
0.81
|
0.78
|
0.76
|
0.75
|
0.74
|
| 4
|
0.82
|
0.78
|
0.74
|
0.73
|
0.72
|
0.72
|
| 5
|
0.80
|
0.76
|
0.72
|
0.71
|
0.70
|
0.70
|
| 6
|
0.79
|
0.75
|
0.71
|
0.70
|
0.69
|
0.68
|
If the conduits or cables are spaced 10" vertically
and horizontally, no correction need be applied in any case.
5kV
thru 35kV
SINGLE
CONDUCTOR CABLE AMPACITIES
Copper Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air
|
Conductor
Size
(AWG/
kcmil)
|
1
Circuit
Fig. 1
Load Factor
|
2
Circuits
Fig. 2
Load Factor
|
4
Circuits
Fig. 3
Load Factor
|
1
Circuit
Fig. 7
Load Factor
|
2
Circuits
Fig. 8
Load Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11 Indoor
|
Fig.
11 Outdoor
|
|
6
|
121
|
115
|
108
|
115
|
105
|
96
|
105
|
92
|
80
|
161
|
135
|
108
|
156
|
122
|
98
|
118
|
149
|
|
4
|
158
|
149
|
140
|
149
|
136
|
123
|
136
|
118
|
103
|
211
|
171
|
137
|
204
|
155
|
124
|
155
|
197
|
|
2
|
209
|
196
|
183
|
196
|
178
|
160
|
176
|
152
|
132
|
266
|
218
|
175
|
257
|
197
|
158
|
206
|
250
|
|
1
|
239
|
224
|
209
|
224
|
202
|
181
|
201
|
172
|
149
|
305
|
246
|
197
|
294
|
223
|
178
|
237
|
288
|
|
1/0
|
273
|
256
|
237
|
255
|
230
|
206
|
228
|
195
|
168
|
349
|
277
|
223
|
333
|
251
|
201
|
272
|
332
|
|
2/0
|
312
|
292
|
270
|
291
|
261
|
233
|
259
|
221
|
190
|
400
|
312
|
251
|
376
|
283
|
226
|
314
|
383
|
|
3/0
|
357
|
333
|
308
|
332
|
297
|
265
|
295
|
251
|
215
|
458
|
352
|
282
|
424
|
318
|
254
|
361
|
441
|
|
4/0
|
409
|
380
|
350
|
379
|
338
|
300
|
335
|
284
|
243
|
525
|
397
|
318
|
478
|
359
|
286
|
417
|
509
|
|
250
|
451
|
419
|
385
|
418
|
371
|
329
|
368
|
311
|
265
|
574
|
433
|
347
|
522
|
391
|
312
|
463
|
562
|
|
350
|
549
|
507
|
465
|
506
|
447
|
394
|
443
|
372
|
316
|
684
|
515
|
412
|
621
|
464
|
370
|
570
|
692
|
|
500
|
676
|
621
|
566
|
619
|
543
|
477
|
538
|
448
|
380
|
823
|
618
|
493
|
745
|
556
|
443
|
712
|
863
|
|
750
|
849
|
775
|
703
|
773
|
674
|
588
|
667
|
552
|
464
|
1010
|
757
|
604
|
912
|
680
|
541
|
907
|
1082
|
|
1000
|
995
|
905
|
818
|
901
|
782
|
680
|
772
|
636
|
534
|
1162
|
870
|
694
|
1048
|
780
|
620
|
1079
|
1279
|
|
1250
|
1121
|
1016
|
914
|
1011
|
873
|
756
|
862
|
706
|
591
|
1290
|
964
|
768
|
1162
|
863
|
686
|
1231
|
1455
|
|
1500
|
1230
|
1110
|
997
|
1105
|
950
|
821
|
938
|
766
|
640
|
1398
|
1043
|
831
|
1258
|
934
|
741
|
1364
|
1609
|
|
1750
|
1325
|
1193
|
1068
|
1187
|
1017
|
877
|
1003
|
816
|
681
|
1492
|
1112
|
885
|
1340
|
994
|
789
|
1485
|
1747
|
|
2000
|
1409
|
1265
|
1131
|
1258
|
1075
|
926
|
1060
|
860
|
716
|
1572
|
1171
|
931
|
1411
|
1046
|
830
|
1593
|
1871
|
Aluminum Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air
|
Conductor
Size
(AWG/
kcmil)
|
1
Circuit
Fig. 1
Load Factor
|
2
Circuits
Fig. 2
Load Factor
|
4
Circuits
Fig. 3
Load Factor
|
1
Circuit
Fig. 7
Load Factor
|
2
Circuits
Fig. 8
Load Factor
|
| |
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11
Indoor |
Fig.
11
Outdoor |
|
6
|
92
|
88
|
83
|
88
|
81
|
74
|
81
|
71
|
62
|
128
|
104
|
84
|
124
|
95
|
76
|
90
|
118
|
|
4
|
121
|
114
|
108
|
114
|
105
|
95
|
104
|
91
|
80
|
168
|
133
|
107
|
161
|
121
|
97
|
119
|
157
|
|
2
|
161
|
152
|
142
|
152
|
137
|
124
|
137
|
118
|
102
|
210
|
169
|
136
|
202
|
154
|
123
|
159
|
197
|
|
1
|
185
|
173
|
161
|
173
|
156
|
141
|
155
|
134
|
115
|
240
|
191
|
153
|
229
|
173
|
139
|
184
|
228
|
|
1/0
|
211
|
198
|
184
|
197
|
178
|
160
|
177
|
151
|
131
|
275
|
216
|
173
|
259
|
195
|
156
|
211
|
262
|
|
2/0
|
241
|
226
|
209
|
225
|
202
|
181
|
201
|
172
|
148
|
315
|
243
|
195
|
292
|
220
|
176
|
243
|
302
|
|
3/0
|
276
|
258
|
238
|
257
|
230
|
205
|
228
|
194
|
167
|
361
|
274
|
220
|
330
|
248
|
198
|
281
|
349
|
|
4/0
|
317
|
295
|
272
|
294
|
262
|
233
|
260
|
220
|
188
|
409
|
309
|
247
|
372
|
279
|
223
|
324
|
403
|
|
250
|
350
|
325
|
299
|
324
|
288
|
255
|
286
|
241
|
206
|
447
|
337
|
270
|
406
|
304
|
243
|
360
|
447
|
|
350
|
427
|
394
|
362
|
393
|
348
|
307
|
344
|
289
|
246
|
534
|
402
|
321
|
484
|
362
|
289
|
445
|
549
|
|
500
|
527
|
484
|
442
|
483
|
424
|
372
|
419
|
350
|
296
|
644
|
483
|
386
|
583
|
435
|
346
|
558
|
687
|
|
750
|
670
|
612
|
555
|
609
|
531
|
463
|
524
|
434
|
5kV thru 35kV
TRIPLEXED
OR PARALLELED CABLE AMPACITIES SINGLE
CONDUCTORS
Copper
Conductors
|
Underground
in Ducts - Three 1/C Cable Per Duct
|
Direct
Buried Three 1/C Cable Per
Circuit
|
In Air
Three Singles |
|
Conductor
Size
(AWG/
kcmil)
|
1 Circuit
Fig. 4
Load Factor
|
2 Circuits
Fig. 5
Load Factor
|
4 Circuits
Fig. 6
Load Factor
|
1 Circuit
Fig. 9
Load Factor
|
2 Circuits
Fig. 10
Load Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
12
Indoor
|
Fig.
12
Outdoor
|
|
6
|
101
|
97
|
92
|
97
|
91
|
84
|
91
|
81
|
73
|
139
|
114
|
92
|
135
|
104
|
83
|
101
|
130
|
|
4
|
131
|
125
|
119
|
126
|
117
|
108
|
117
|
105
|
93
|
182
|
146
|
117
|
175
|
132
|
105
|
133
|
171
|
|
2
|
174
|
166
|
156
|
167
|
154
|
141
|
154
|
136
|
120
|
234
|
189
|
152
|
224
|
170
|
136
|
179
|
219
|
|
1
|
199
|
189
|
178
|
190
|
175
|
160
|
175
|
154
|
135
|
268
|
214
|
172
|
254
|
192
|
153
|
205
|
252
|
|
1/0
|
227
|
215
|
202
|
216
|
199
|
181
|
198
|
174
|
153
|
306
|
242
|
194
|
287
|
216
|
173
|
235
|
289
|
|
2/0
|
259
|
245
|
230
|
246
|
226
|
205
|
225
|
197
|
173
|
351
|
273
|
219
|
324
|
244
|
195
|
270
|
332
|
|
3/0
|
295
|
279
|
261
|
280
|
256
|
233
|
256
|
223
|
195
|
402
|
308
|
247
|
366
|
275
|
220
|
311
|
382
|
|
4/0
|
337
|
317
|
297
|
319
|
291
|
264
|
290
|
253
|
221
|
460
|
349
|
279
|
413
|
310
|
248
|
358
|
439
|
|
250
|
372
|
350
|
326
|
352
|
320
|
289
|
319
|
277
|
241
|
504
|
382
|
306
|
452
|
339
|
271
|
398
|
485
|
|
350
|
450
|
422
|
392
|
424
|
384
|
346
|
383
|
331
|
287
|
603
|
455
|
364
|
539
|
404
|
322
|
488
|
594
|
|
500
|
549
|
513
|
475
|
516
|
465
|
417
|
463
|
398
|
344
|
727
|
547
|
437
|
647
|
483
|
385
|
605
|
735
|
|
750
|
680
|
633
|
584
|
636
|
571
|
510
|
568
|
485
|
418
|
892
|
671
|
536
|
791
|
590
|
470
|
760
|
905
|
|
1000
|
786
|
728
|
670
|
733
|
654
|
582
|
651
|
533
|
474
|
1023
|
767
|
612
|
903
|
672
|
535
|
893
|
1056
|
Aluminum Conductor
|
Underground
in Ducts - Three 1/C Cable Per Duct
|
Direct
Buried Three 1/C Cable
Per Circuit
|
In
Air
Three Singles |
|
Conductor
Size
(AWG/
kcmil)
|
1 Circuit
Fig. 4
Load Factor
|
2 Circuits
Fig. 5
Load Factor
|
4 Circuits
Fig. 6
Load Factor
|
1 Circuit
Fig. 9
Load Factor
|
2 Circuits
Fig. 10
Load Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
12
Indoor |
Fig.
12
Outdoor |
|
6
|
76
|
73
|
70
|
74
|
69
|
64
|
69
|
62
|
56
|
109
|
88
|
71
|
105
|
80
|
64
|
77
|
101
|
|
4
|
99
|
95
|
90
|
96
|
89
|
83
|
89
|
80
|
71
|
142
|
112
|
90
|
135
|
102
|
81
|
101
|
133
|
|
2
|
134
|
127
|
120
|
128
|
118
|
109
|
118
|
105
|
93
|
182
|
146
|
118
|
173
|
131
|
105
|
137
|
171
|
|
1
|
153
|
145
|
137
|
146
|
135
|
123
|
134
|
119
|
105
|
208
|
165
|
133
|
196
|
148
|
119
|
157
|
197
|
|
1/0
|
174
|
165
|
156
|
166
|
153
|
140
|
153
|
134
|
118
|
239
|
187
|
150
|
222
|
167
|
134
|
181
|
226
|
|
2/0
|
199
|
188
|
177
|
189
|
174
|
158
|
173
|
152
|
134
|
273
|
211
|
169
|
250
|
189
|
151
|
208
|
260
|
|
3/0
|
227
|
215
|
201
|
216
|
198
|
180
|
197
|
173
|
151
|
313
|
238
|
191
|
283
|
213
|
170
|
239
|
299
|
|
4/0
|
260
|
245
|
229
|
246
|
225
|
204
|
224
|
196
|
171
|
356
|
270
|
216
|
320
|
241
|
192
|
276
|
344
|
|
250
|
286
|
270
|
252
|
271
|
247
|
224
|
246
|
214
|
187
|
390
|
295
|
236
|
350
|
263
|
210
|
307
|
381
|
|
350
|
349
|
327
|
304
|
329
|
298
|
269
|
297
|
257
|
223
|
468
|
353
|
283
|
419
|
314
|
250
|
378
|
467
|
|
500
|
428
|
400
|
371
|
402
|
363
|
326
|
361
|
311
|
269
|
567
|
427
|
341
|
506
|
378
|
301
|
472
|
581
|
|
750
|
539
|
501
|
463
|
504
|
452
|
404
|
449
|
384
|
330
|
704
|
528
|
421
|
624
|
465
|
370
|
608
|
743
|
|
1000
|
629
|
584
|
537
|
587
|
524
|
466
|
520
|
442
|
379
|
819
|
614
|
490
|
724
|
539
|
429
|
717
|
855
|
5kV
thru 35kV
THREE
CONDUCTOR CABLE AMPACITIES
Copper
Conductors
|
Conductor
Size
(AWG/
kcmil)
|
Underground
in Ducts - One 3/C Cable Per Duct |
Direct
Buried One 3/C Cable
Per Circuit
|
In
Air
One 3/C Cable |
1
Circuit
Fig. 4
Load Factor |
2 Circuits
Fig. 5
Load Factor
|
4 Circuits
Fig. 6
Load Factor
|
1 Circuit
Fig. 9
Load Factor
|
2 Circuits
Fig. 10
Load Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
12
Indoor |
Fig.
12
Outdoor |
|
6
|
97
|
93
|
89
|
84
|
88
|
82
|
88
|
79
|
71
|
126
|
114
|
92
|
123
|
103
|
83
|
95
|
112
|
|
4
|
125
|
120
|
114
|
121
|
113
|
105
|
113
|
102
|
91
|
161
|
145
|
117
|
157
|
131
|
106
|
123
|
144
|
|
2
|
166
|
158
|
150
|
159
|
148
|
136
|
147
|
131
|
117
|
210
|
188
|
152
|
203
|
169
|
136
|
164
|
187
|
|
1
|
189
|
180
|
170
|
181
|
168
|
154
|
167
|
149
|
132
|
240
|
212
|
172
|
232
|
190
|
153
|
188
|
214
|
|
1/0
|
215
|
205
|
193
|
206
|
190
|
175
|
190
|
169
|
149
|
274
|
240
|
194
|
265
|
215
|
173
|
215
|
245
|
|
2/0
|
245
|
233
|
220
|
234
|
216
|
198
|
216
|
191
|
169
|
313
|
270
|
219
|
302
|
242
|
195
|
247
|
280
|
|
3/0
|
277
|
263
|
248
|
265
|
244
|
223
|
244
|
215
|
190
|
353
|
306
|
247
|
340
|
273
|
220
|
280
|
315
|
|
4/0
|
316
|
300
|
282
|
301
|
277
|
253
|
276
|
243
|
214
|
403
|
345
|
279
|
288
|
308
|
248
|
321
|
361
|
|
250
|
348
|
330
|
310
|
331
|
304
|
277
|
303
|
267
|
234
|
445
|
378
|
305
|
428
|
337
|
270
|
355
|
399
|
|
350
|
420
|
397
|
372
|
399
|
365
|
332
|
364
|
318
|
279
|
540
|
451
|
364
|
518
|
400
|
321
|
433
|
485
|
|
500
|
511
|
482
|
450
|
484
|
441
|
399
|
439
|
383
|
334
|
662
|
541
|
436
|
633
|
479
|
384
|
534
|
595
|
|
750
|
632
|
593
|
552
|
596
|
541
|
488
|
538
|
466
|
405
|
820
|
664
|
534
|
773
|
585
|
469
|
667
|
735
|
|
1000
|
729
|
682
|
633
|
686
|
620
|
557
|
616
|
531
|
460
|
952
|
758
|
610
|
883
|
666
|
533
|
779
|
852
|
Aluminum
Conductors
Conductor
Size
(AWG/
kcmil)
|
Underground
in Ducts - One 3/C Cable Per Duct |
Direct
Buried One 3/C
Cable
Per Circuit
|
In Air
One 3/C Cable |
1
Circuit
Fig. 4
Load Factor |
2 Circuits
Fig. 5
Load Factor |
4 Circuits
Fig. 6
Load Factor |
1 Circuit
Fig. 9
Load Factor |
2 Circuits
Fig. 10
Load Factor
|
|
| 50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
12
Indoor |
Fig.
12
Outdoor |
|
6
|
74
|
71
|
70
|
71
|
67
|
64
|
67
|
61
|
56
|
98
|
87
|
71
|
95
|
79
|
64
|
72
|
87
|
|
4
|
96
|
92
|
90
|
92
|
87
|
83
|
87
|
78
|
72
|
127
|
112
|
90
|
123
|
101
|
81
|
94
|
113
|
|
2
|
127
|
122
|
115
|
122
|
114
|
105
|
113
|
101
|
90
|
162
|
145
|
117
|
157
|
130
|
105
|
126
|
145
|
|
1
|
145
|
138
|
131
|
139
|
129
|
119
|
129
|
115
|
102
|
186
|
164
|
133
|
180
|
147
|
119
|
144
|
166
|
|
1/0
|
165
|
158
|
149
|
158
|
147
|
135
|
146
|
130
|
11
5 |
212
|
185
|
150
|
205
|
166
|
134
|
165
|
190
|
|
2/0
|
188
|
179
|
169
|
180
|
167
|
153
|
166
|
147
|
130
|
243
|
209
|
169
|
234
|
187
|
151
|
190
|
217
|
|
3/0
|
215
|
204
|
192
|
205
|
189
|
173
|
189
|
167
|
147
|
277
|
236
|
191
|
267
|
211
|
170
|
217
|
249
|
|
4/0
|
245
|
232
|
219
|
233
|
215
|
197
|
214
|
189
|
166
|
317
|
267
|
216
|
305
|
239
|
192
|
250
|
285
|
|
250
|
268
|
254
|
239
|
255
|
235
|
215
|
234
|
206
|
181
|
345
|
292
|
236
|
332
|
261
|
210
|
274
|
310
|
|
350
|
325
|
308
|
289
|
309
|
283
|
258
|
282
|
247
|
217
|
421
|
350
|
282
|
404
|
311
|
250
|
336
|
378
|
|
500
|
398
|
375
|
351
|
377
|
344
|
312
|
342
|
298
|
261
|
518
|
422
|
340
|
493
|
375
|
301
|
416
|
467
|
|
750
|
500
|
470
|
437
|
472
|
428
|
386
|
425
|
368
|
320
|
656
|
522
|
420
|
609
|
461
|
369
|
530
|
592
|
|
1000
|
583
|
546
|
507
|
548
|
496
|
446
|
492
|
425
|
368
|
764
|
607
|
488
|
706
|
534
|
427
|
624
|
686
|
46kV
thru 69kV
SINGLE
CONDUCTOR CABLE AMPACITIES
Copper
Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air |
|
Conductor
Size
(AWG/
kcmil)
|
1
Circuit
Fig. 1
Load Factor |
2 Circuits
Fig. 2
Load Factor
|
4 Circuits
Fig. 3
Load Factor
|
1
Circuit
Fig. 7
Load Factor |
2 Circuits
Fig. 8
Load Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11
Indoor |
Fig.
11
Outdoor |
|
4/0
|
405
|
377
|
348
|
375
|
335
|
297
|
330
|
280
|
239
|
476
|
398
|
321
|
459
|
359
|
288
|
404
|
450
|
|
250
|
446
|
414
|
381
|
412
|
367
|
325
|
362
|
306
|
261
|
524
|
434
|
350
|
505
|
391
|
313
|
447
|
498
|
|
350
|
541
|
500
|
459
|
497
|
440
|
389
|
434
|
365
|
311
|
638
|
516
|
415
|
612
|
464
|
371
|
548
|
612
|
|
500
|
662
|
610
|
557
|
606
|
534
|
470
|
526
|
439
|
372
|
786
|
618
|
497
|
735
|
555
|
444
|
680
|
760
|
|
750
|
831
|
761
|
692
|
756
|
661
|
579
|
650
|
539
|
455
|
990
|
756
|
607
|
900
|
677
|
541
|
868
|
968
|
|
1000
|
972
|
886
|
803
|
879
|
765
|
667
|
751
|
620
|
522
|
1147
|
868
|
695
|
1034
|
776
|
620
|
1029
|
1147
|
|
1250
|
1087
|
989
|
893
|
981
|
851
|
740
|
834
|
686
|
576
|
1271
|
961
|
770
|
1144
|
858
|
685
|
1160
|
1285
|
|
1500
|
1190
|
1079
|
973
|
1070
|
925
|
803
|
905
|
743
|
623
|
1378
|
1040
|
832
|
1238
|
927
|
740
|
1282
|
1420
|
|
1750
|
1280
|
1158
|
1042
|
1148
|
989
|
856
|
967
|
791
|
662
|
1469
|
1107
|
885
|
1318
|
987
|
787
|
1391
|
1540
|
|
2000
|
1360
|
1227
|
1102
|
1215
|
1045
|
903
|
1021
|
833
|
696
|
1548
|
1165
|
931
|
1388
|
1038
|
827
|
1489
|
1647
|
Aluminum Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air |
|
Conductor
Size
(AWG/
kcmil)
|
1 Circuit
Fig.
1
Load
Factor
|
2 Circuits
Fig.
2
Load
Factor
|
4 Circuits
Fig.
3
Load
Factor
|
1 Circuit
Fig.
7
Load
Factor
|
2 Circuits
Fig.
8
Load
Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11
Indoor
|
Fig.
11
Outdoor
|
|
4/0
|
316
|
294
|
271
|
292
|
261
|
232
|
258
|
218
|
187
|
371
|
310
|
251
|
258
|
280
|
225
|
315
|
351
|
|
250
|
348
|
323
|
297
|
321
|
286
|
254
|
282
|
238
|
204
|
409
|
339
|
273
|
394
|
305
|
245
|
349
|
389
|
|
350
|
422
|
390
|
358
|
388
|
344
|
304
|
339
|
285
|
242
|
498
|
403
|
324
|
478
|
362
|
348
|
428
|
478
|
|
500
|
518
|
477
|
436
|
474
|
418
|
367
|
411
|
344
|
291
|
615
|
484
|
389
|
575
|
434
|
390
|
532
|
595
|
|
750
|
655
|
599
|
545
|
595
|
521
|
456
|
512
|
425
|
358
|
780
|
596
|
478
|
709
|
533
|
426
|
684
|
764
|
|
1000
|
770
|
702
|
636
|
697
|
607
|
529
|
595
|
492
|
424
|
909
|
689
|
552
|
819
|
616
|
492
|
816
|
909
|
|
1250
|
869
|
790
|
714
|
784
|
680
|
591
|
666
|
548
|
461
|
1016
|
769
|
616
|
915
|
687
|
548
|
927
|
1027
|
|
1500
|
960
|
871
|
785
|
863
|
746
|
647
|
730
|
599
|
502
|
1112
|
839
|
672
|
999
|
749
|
597
|
1034
|
1146
|
|
1750
|
1043
|
943
|
848
|
935
|
806
|
697
|
788
|
644
|
539
|
1197
|
902
|
722
|
1074
|
804
|
641
|
1133
|
1255
|
|
2000
|
1118
|
1009
|
906
|
1000
|
859
|
742
|
839
|
685
|
572
|
1273
|
959
|
767
|
1142
|
854
|
681
|
1225
|
1355
|
115kV
thru 138kV
SINGLE
CONDUCTOR CABLE AMPACITIES
Copper
Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air |
|
Conductor
Size
(AWG/
kcmil)
|
1
Circuit
Fig.
1
Load
Factor
|
2
Circuits
Fig.
2
Load
Factor
|
4
Circuits
Fig.
3
Load
Factor
|
1
Circuit
Fig.
7
Load
Factor
|
2
Circuits
Fig.
8
Load
Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11
Indoor
|
Fig.
11
Outdoor
|
|
500
|
663
|
584
|
535
|
574
|
507
|
447
|
486
|
408
|
347
|
726
|
605
|
491
|
696
|
540
|
436
|
645
|
690
|
|
750
|
790
|
726
|
662
|
711
|
625
|
549
|
596
|
497
|
421
|
912
|
739
|
598
|
856
|
658
|
530
|
819
|
877
|
|
1000
|
921
|
843
|
766
|
824
|
720
|
631
|
684
|
568
|
479
|
1068
|
847
|
685
|
982
|
753
|
606
|
966
|
1035
|
|
1250
|
1032
|
942
|
854
|
919
|
801
|
699
|
757
|
626
|
527
|
1202
|
937
|
756
|
1086
|
831
|
668
|
1095
|
1173
|
|
1500
|
1127
|
1026
|
928
|
1000
|
868
|
756
|
818
|
674
|
566
|
1311
|
1012
|
817
|
1174
|
897
|
720
|
1208
|
1294
|
|
1750
|
1210
|
1099
|
992
|
1069
|
926
|
805
|
869
|
715
|
599
|
1398
|
1076
|
868
|
1250
|
953
|
765
|
1309
|
1401
|
|
2000
|
1238
|
1163
|
1048
|
1130
|
976
|
847
|
913
|
749
|
627
|
1473
|
1132
|
912
|
1314
|
1001
|
803
|
1399
|
1497
|
Aluminum Conductors
|
Underground
in Ducts - One Single Per Duct
|
Direct
Buried
|
In
Air |
|
Conductor
Size
(AWG/
kcmil)
|
1
Circuit
Fig.
1
Load
Factor |
2 Circuits
Fig.
2
Load
Factor
|
4 Circuits
Fig.
3
Load
Factor
|
1 Circuit
Fig.
7
Load
Factor
|
2 Circuits
Fig.
8
Load
Factor
|
|
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
50
|
75
|
100
|
Fig.
11
Indoor
|
Fig.
11
Outdoor
|
|
500
|
495
|
457
|
419
|
449
|
397
|
350
|
381
|
319
|
272
|
568
|
474
|
385
|
545
|
423
|
342
|
505
|
540
|
|
750
|
622
|
572
|
522
|
560
|
492
|
432
|
470
|
391
|
331
|
719
|
582
|
471
|
674
|
518
|
418
|
645
|
691
|
|
1000
|
730
|
668
|
608
|
653
|
571
|
500
|
542
|
450
|
380
|
847
|
671
|
543
|
778
|
597
|
481
|
766
|
821
|
|
1250
|
825
|
753
|
683
|
735
|
640
|
558
|
605
|
500
|
421
|
961
|
749
|
605
|
868
|
665
|
535
|
875
|
938
|
|
1500
|
910
|
828
|
749
|
807
|
700
|
610
|
660
|
544
|
457
|
1058
|
817
|
659
|
948
|
724
|
582
|
975
|
1044
|
|
1750
|
986
|
895
|
808
|
871
|
754
|
655
|
708
|
582
|
488
|
1139
|
877
|
708
|
1018
|
777
|
624
|
1066
|
1142
|
|
2000
|
1055
|
957
|
862
|
929
|
803
|
696
|
751
|
616
|
516
|
1211
|
931
|
751
|
1081
|
824
|
661
|
1150
|
1232
|
|
