Current-Carrying Capacity of Three-Conductor Shielded Paper-Insulated Cables
Conductor Size AWG or MCM |
Conductor Typea |
||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of Equally Loaded |
Cables in Duct Bank |
||||||||||||||||||||
One |
Three |
Six Percent Load Factor |
Nine |
Twelve |
|||||||||||||||||
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 | ||
Amperes per Conductorb |
Amperes per Conductorb |
||||||||||||||||||||
15,000 V |
Copper Temperature 81°C |
Copper Temperature 81°C |
|||||||||||||||||||
6 |
S |
94 |
91 |
88 |
83 |
91 |
87 |
81 |
75 |
89 |
83 |
74 |
66 |
87 |
78 |
69 |
60 |
84 |
75 |
64 |
56 |
4 |
SR |
123 |
120 |
115 |
107 |
119 |
114 |
104 |
95 |
116 |
108 |
95 |
85 |
113 |
102 |
89 |
77 |
109 |
96 |
83 |
75 |
2 |
SR |
159 |
154 |
146 |
137 |
153 |
144 |
139 |
121 |
149 |
136 |
120 |
107 |
144 |
129 |
112 |
97 |
139 |
123 |
104 |
90 |
1 |
SR |
179 |
174 |
166 |
156 |
172 |
163 |
149 |
136 |
168 |
153 |
136 |
121 |
162 |
145 |
125 |
109 |
158 |
138 |
117 |
100 |
0 |
CS |
203 |
195 |
182 |
176 |
196 |
185 |
169 |
154 |
190 |
173 |
154 |
137 |
183 |
164 |
141 |
122 |
178 |
156 |
131 |
112 |
00 |
CS |
234 |
224 |
215 |
202 |
225 |
212 |
193 |
175 |
218 |
198 |
174 |
156 |
211 |
187 |
162 |
139 |
203 |
177 |
148 |
127 |
000 |
CS |
270 |
258 |
245 |
230 |
258 |
242 |
220 |
198 |
249 |
225 |
198 |
174 |
241 |
212 |
182 |
157 |
232 |
202 |
168 |
144 |
0000 |
CS |
308 |
295 |
281 |
261 |
295 |
276 |
250 |
223 |
285 |
257 |
224 |
196 |
275 |
241 |
205 |
176 |
265 |
227 |
189 |
162 |
250 |
CS |
341 |
327 |
310 |
290 |
325 |
305 |
276 |
246 |
315 |
283 |
245 |
215 |
303 |
265 |
224 |
193 |
291 |
250 |
207 |
177 |
300 |
CS |
383 |
365 |
344 |
320 |
364 |
339 |
305 |
272 |
351 |
313 |
271 |
236 |
337 |
293 |
246 |
211 |
322 |
276 |
227 |
194 |
350 |
CS |
417 |
397 |
375 |
346 |
397 |
369 |
330 |
293 |
383 |
340 |
293 |
255 |
366 |
318 |
267 |
227 |
350 |
301 |
245 |
208 |
400 |
CS |
453 |
428 |
403 |
373 |
429 |
396 |
354 |
314 |
413 |
366 |
313 |
273 |
394 |
340 |
285 |
242 |
376 |
320 |
262 |
222 |
500 |
CS |
513 |
487 |
450 |
418 |
483 |
446 |
399 |
350 |
467 |
410 |
350 |
303 |
444 |
381 |
318 |
269 |
419 |
358 |
292 |
247 |
600 |
CS |
567 |
537 |
501 |
460 |
534 |
491 |
437 |
385 |
513 |
450 |
384 |
330 |
488 |
416 |
346 |
293 |
465 |
390 |
317 |
269 |
750 |
CS |
643 |
606 |
562 |
514 |
602 |
551 |
485 |
426 |
576 |
502 |
423 |
365 |
545 |
464 |
383 |
323 |
519 |
432 |
348 |
293 |
(1.08 at 10°C, |
(1.08 at 10°C, |
(1.08 at 10°C, |
(1.08 at 10°C, |
(1.08 at 10°C, |
|||||||||||||||||
0.91 at 30°C, |
0.91 at 30°C, |
0.91 at 30°C, |
0.91 at 30°C, |
0.91 at 30°C, |
|||||||||||||||||
0.82 at 40°C, |
0.82 at 40°C, |
0.82 at 40°C, |
0.82 at 40°C, |
0.82 at 40°C, |
|||||||||||||||||
0.71 at 50°C)b |
0.71 at 50°C)b |
0.71 at 50°C)b |
0.71 at 50°C)b |
0.71 at 50°C)b |
|||||||||||||||||
23,000 V |
Copper Temperature 77°C |
Copper Temperature 77°C |
|||||||||||||||||||
2 |
SR |
156 |
150 |
143 |
134 |
149 |
141 |
130 |
117 |
145 |
132 |
117 |
105 |
140 |
125 |
107 |
84 |
134 |
119 |
100 |
86 |
1 |
SR |
177 |
170 |
162 |
152 |
170 |
160 |
145 |
133 |
164 |
149 |
132 |
117 |
159 |
140 |
121 |
105 |
154 |
133 |
112 |
97 |
0 |
CS |
200 |
192 |
183 |
172 |
192 |
182 |
166 |
149 |
186 |
169 |
147 |
132 |
178 |
158 |
136 |
118 |
173 |
149 |
126 |
109 |
00 |
CS |
227 |
220 |
210 |
197 |
221 |
208 |
189 |
170 |
212 |
193 |
168 |
149 |
202 |
181 |
156 |
134 |
196 |
172 |
144 |
123 |
000 |
CS |
262 |
251 |
238 |
223 |
254 |
238 |
216 |
193 |
242 |
220 |
191 |
169 |
230 |
206 |
175 |
150 |
222 |
195 |
162 |
139 |
0000 |
CS |
301 |
289 |
271 |
251 |
291 |
273 |
246 |
219 |
278 |
250 |
215 |
190 |
264 |
233 |
197 |
169 |
255 |
221 |
182 |
157 |
250 |
CS |
334 |
315 |
298 |
277 |
321 |
299 |
270 |
239 |
308 |
275 |
236 |
207 |
290 |
258 |
216 |
184 |
279 |
242 |
199 |
170 |
300 |
CS |
373 |
349 |
328 |
306 |
354 |
329 |
297 |
263 |
341 |
302 |
259 |
227 |
320 |
283 |
232 |
202 |
309 |
266 |
217 |
186 |
350 |
CS |
405 |
379 |
358 |
331 |
384 |
356 |
318 |
283 |
369 |
327 |
280 |
243 |
347 |
305 |
255 |
217 |
335 |
285 |
233 |
199 |
400 |
CS |
434 |
409 |
386 |
356 |
412 |
379 |
340 |
302 |
396 |
348 |
298 |
260 |
374 |
325 |
273 |
232 |
359 |
303 |
247 |
211 |
500 |
CS |
492 |
465 |
436 |
401 |
461 |
427 |
379 |
335 |
443 |
391 |
333 |
288 |
424 |
363 |
302 |
257 |
400 |
336 |
275 |
230 |
600 |
CS |
543 |
516 |
484 |
440 |
512 |
470 |
414 |
366 |
489 |
428 |
365 |
313 |
464 |
396 |
329 |
279 |
441 |
367 |
299 |
248 |
750 |
CS |
616 |
583 |
541 |
495 |
577 |
528 |
465 |
407 |
550 |
479 |
402 |
347 |
520 |
439 |
364 |
306 |
490 |
408 |
329 |
276 |
(1.09 at 10°C, |
(1.09 at 10°C, |
(1.09 at 10°C, |
(1.09 at 10°C, |
(1.09 at 10°C, |
|||||||||||||||||
0.90 at 30°C, |
0.90 at 30°C, |
0.90 at 30°C, |
0.90 at 30°C, |
0.90 at 30°C, |
|||||||||||||||||
0.80 at 40°C, |
0.80 at 40°C, |
0.79 at 40°C, |
0.79 at 40°C, |
0.79 at 40°C, |
|||||||||||||||||
0.67 at 50°C)b |
0.67 at 50°C)c |
0.67 at 50°C)c |
0.66 at 50°C)c |
0.65 at 50°C)a |
|||||||||||||||||
34,000 V |
Copper Temperature 70°C |
Copper Temperature 70°C |
|||||||||||||||||||
0 |
CS |
193 |
185 |
176 |
165 |
184 |
174 |
158 |
141 |
178 |
161 |
140 |
124 |
171 |
149 |
129 |
111 |
164 |
142 |
119 |
103 |
00 |
CS |
219 |
209 |
199 |
187 |
208 |
197 |
178 |
160 |
202 |
182 |
158 |
140 |
194 |
170 |
145 |
126 |
185 |
161 |
134 |
115 |
000 |
CS |
250 |
238 |
225 |
211 |
238 |
222 |
202 |
182 |
229 |
206 |
179 |
158 |
220 |
193 |
165 |
141 |
209 |
182 |
152 |
128 |
0000 |
CS |
288 |
275 |
260 |
241 |
273 |
256 |
229 |
205 |
263 |
234 |
203 |
179 |
251 |
219 |
186 |
160 |
238 |
205 |
170 |
144 |
250 |
CS |
316 |
302 |
285 |
266 |
301 |
280 |
253 |
224 |
289 |
258 |
222 |
196 |
276 |
240 |
202 |
174 |
262 |
222 |
187 |
157 |
300 |
CS |
352 |
335 |
315 |
293 |
334 |
310 |
278 |
246 |
320 |
284 |
244 |
213 |
304 |
264 |
221 |
190 |
288 |
244 |
203 |
171 |
350 |
CS |
384 |
364 |
342 |
318 |
363 |
336 |
301 |
267 |
346 |
308 |
264 |
229 |
329 |
285 |
238 |
204 |
311 |
263 |
217 |
184 |
400 |
CS |
413 |
392 |
367 |
341 |
384 |
360 |
321 |
284 |
372 |
329 |
281 |
244 |
352 |
303 |
254 |
216 |
334 |
282 |
232 |
195 |
500 |
CS |
468 |
442 |
414 |
381 |
436 |
402 |
358 |
317 |
418 |
367 |
312 |
271 |
393 |
337 |
281 |
238 |
372 |
313 |
256 |
215 |
600 |
CS |
514 |
487 |
455 |
416 |
481 |
440 |
391 |
344 |
459 |
401 |
340 |
294 |
430 |
367 |
304 |
259 |
406 |
340 |
277 |
232 |
750 |
CS |
584 |
548 |
510 |
466 |
541 |
496 |
435 |
383 |
515 |
447 |
378 |
324 |
481 |
409 |
337 |
284 |
452 |
377 |
304 |
255 |
(1.10 at 10°C, |
(1.10 at 10°C, |
(1.10 at 10°C, |
(1.10 at 10°C, |
(1.10 at 10°C, |
|||||||||||||||||
0.89 at 30°C, |
0.89 at 30°C, |
0.89 at 30°C, |
0.88 at 30°C, |
0.88 at 30°C, |
|||||||||||||||||
0.76 at 40°C, |
0.76 at 40°C, |
0.76 at 40°C, |
0.75 at 40°C, |
0.74 at 40°C, |
|||||||||||||||||
0.61 at 50°C)c |
0.60 at 50°C)b |
0.60 at 50°C)1 |
0.58 at 50°C)3 |
0.56 at 50°C)3 |
Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.
a The following symbols are used here to designate conductor types: S, solid copper; SR, standard round concentric-stranded; CS, compact-sector-stranded.
b Current ratings are based on the following conditions:
1. Ambient earth temperature = 20°C.
2. 60-cycle alternating current.
3. Ratings include dielectric loss, and all induced AC losses.
4. One cable per duct, all cables equally loaded and in outside ducts only.
c Multiply tabulated currents by these factors when earth temperature is other than 20°C.
Current-Carrying Capacity of Single-Conductor Solid Paper-Insulated Cables
Number of Equally Loaded Cables in Duct Bank |
||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Conductor Size AWG or MCM |
||||||||||||||||||
Three |
Six Percent Load Factor |
Nine |
Twelve |
|||||||||||||||
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
30 |
50 |
75 |
100 |
|||
Amperes per Conductora |
Amperes per Conductora |
|||||||||||||||||
7,500 V |
Copper Temperature 85°C |
Copper Temperature 85°C |
||||||||||||||||
6 |
116 |
113 |
109 |
103 |
115 |
110 |
103 |
96 |
113 |
107 |
98 |
90 |
111 |
104 |
94 |
85 |
||
4 |
164 |
149 |
142 |
135 |
152 |
144 |
134 |
125 |
149 |
140 |
128 |
116 |
147 |
136 |
122 |
110 |
||
2 |
202 |
196 |
186 |
175 |
199 |
189 |
175 |
162 |
196 |
183 |
167 |
151 |
192 |
178 |
159 |
142 |
||
1 |
234 |
226 |
214 |
201 |
230 |
218 |
201 |
185 |
226 |
210 |
190 |
172 |
222 |
204 |
181 |
162 |
||
0 |
270 |
262 |
245 |
232 |
266 |
251 |
231 |
212 |
261 |
242 |
219 |
196 |
256 |
234 |
208 |
184 |
||
00 |
311 |
300 |
283 |
262 |
309 |
290 |
270 |
241 |
303 |
278 |
250 |
224 |
295 |
268 |
236 |
208 |
||
000 |
356 |
344 |
324 |
300 |
356 |
333 |
303 |
275 |
348 |
319 |
285 |
255 |
340 |
308 |
270 |
236 |
||
0000 |
412 |
395 |
371 |
345 |
408 |
380 |
347 |
314 |
398 |
364 |
325 |
290 |
390 |
352 |
307 |
269 |
||
250 |
456 |
438 |
409 |
379 |
449 |
418 |
379 |
344 |
437 |
400 |
358 |
316 |
427 |
386 |
336 |
294 |
||
300 |
512 |
491 |
459 |
423 |
499 |
464 |
420 |
380 |
486 |
442 |
394 |
349 |
474 |
428 |
371 |
325 |
||
350 |
561 |
537 |
500 |
460 |
546 |
507 |
457 |
403 |
532 |
483 |
429 |
379 |
518 |
466 |
403 |
352 |
||
400 |
607 |
580 |
540 |
496 |
593 |
548 |
493 |
445 |
576 |
522 |
461 |
407 |
560 |
502 |
434 |
378 |
||
500 |
692 |
660 |
611 |
561 |
679 |
626 |
560 |
504 |
659 |
597 |
524 |
459 |
641 |
571 |
490 |
427 |
||
600 |
772 |
735 |
679 |
621 |
757 |
696 |
621 |
557 |
733 |
663 |
579 |
506 |
714 |
632 |
542 |
470 |
||
700 |
846 |
804 |
741 |
677 |
827 |
758 |
674 |
604 |
802 |
721 |
629 |
548 |
779 |
688 |
587 |
508 |
||
750 |
881 |
837 |
771 |
702 |
860 |
789 |
700 |
627 |
835 |
750 |
651 |
568 |
810 |
714 |
609 |
526 |
||
800 |
914 |
866 |
797 |
725 |
892 |
817 |
726 |
648 |
865 |
776 |
674 |
588 |
840 |
740 |
630 |
544 |
||
1000 |
1037 |
980 |
898 |
816 |
1012 |
922 |
815 |
725 |
980 |
874 |
758 |
657 |
950 |
832 |
705 |
606 |
||
1250 |
1176 |
1108 |
1012 |
914 |
1145 |
1039 |
914 |
809 |
1104 |
981 |
845 |
730 |
1068 |
941 |
784 |
673 |
||
1500 |
1300 |
1224 |
1110 |
1000 |
1268 |
1146 |
1000 |
884 |
1220 |
1078 |
922 |
794 |
1178 |
1032 |
855 |
731 |
||
1750 |
1420 |
1332 |
1204 |
1080 |
1382 |
1240 |
1078 |
949 |
1342 |
1166 |
992 |
851 |
1280 |
1103 |
919 |
783 | ||
2000 |
1546 |
1442 |
1300 |
1162 |
1500 |
1343 |
1162 |
1019 |
1442 |
1260 |
1068 |
914 |
1385 |
1190 |
986 |
839 | ||
(1.07 at 10°C, |
(1.07 at 10°C, 0.92 |
(1.07 at 10°C, 0.92 |
(1.07 at 10°C, 0.92 |
|||||||||||||||
0.92 at 30°C, 0.83 |
at 30°C, 0.83 |
at 30°C, 0.83 |
at 40°C, 0.73 at 50°C) |
|||||||||||||||
at 40°C, 0.73 at 50°C)b |
at 40°C, 0.73 at 50°C)b |
at 40°C, 0.73 at 50°C)b |
at 40°C, 0.73 at 50°C)b |
|||||||||||||||
15,000 V |
Copper Temperature 81°C |
Copper Temperature 81°C |
||||||||||||||||
6 |
113 |
110 |
105 |
100 |
112 |
107 |
100 |
93 |
110 |
104 |
96 |
87 |
108 |
10L |
92 |
83 |
||
4 |
149 |
145 |
138 |
131 |
147 |
140 |
131 |
117 |
144 |
136 |
125 |
114 |
142 |
132 |
119 |
107 |
||
2 |
195 |
190 |
180 |
170 |
193 |
183 |
170 |
157 |
189 |
177 |
161 |
146 |
186 |
172 |
154 |
137 |
||
1 |
226 |
218 |
208 |
195 |
222 |
211 |
195 |
179 |
218 |
204 |
185 |
167 |
214 |
197 |
175 |
157 |
||
0 |
256 |
248 |
234 |
220 |
252 |
239 |
220 |
203 |
247 |
230 |
209 |
188 |
242 |
223 |
198 |
177 |
||
00 |
297 |
287 |
271 |
254 |
295 |
278 |
253 |
232 |
287 |
265 |
239 |
214 |
283 |
257 |
226 |
202 |
||
000 |
344 |
330 |
312 |
290 |
341 |
320 |
293 |
267 |
333 |
306 |
274 |
245 |
327 |
296 |
260 |
230 |
||
0000 |
399 |
384 |
361 |
335 |
392 |
367 |
335 |
305 |
383 |
352 |
315 |
280 |
374 |
340 |
298 |
263 |
||
250 |
440 |
423 |
396 |
367 |
432 |
404 |
367 |
334 |
422 |
387 |
345 |
306 |
412 |
372 |
325 |
286 |
||
300 |
490 |
470 |
439 |
406 |
481 |
449 |
406 |
369 |
470 |
429 |
382 |
338 |
457 |
413 |
359 |
316 |
||
350 |
539 |
516 |
481 |
444 |
527 |
491 |
443 |
401 |
514 |
468 |
416 |
367 |
501 |
450 |
391 |
342 |
||
400 |
586 |
561 |
522 |
480 |
572 |
530 |
478 |
432 |
556 |
506 |
447 |
395 |
542 |
485 |
419 |
366 |
||
500 |
669 |
639 |
592 |
543 |
655 |
605 |
542 |
488 |
636 |
577 |
507 |
445 |
618 |
551 |
474 |
412 |
||
600 |
746 |
710 |
656 |
601 |
727 |
668 |
598 |
537 |
705 |
637 |
557 |
488 |
685 |
608 |
521 |
452 |
||
700 |
810 |
772 |
712 |
652 |
790 |
726 |
647 |
581 |
766 |
691 |
604 |
528 |
744 |
659 |
564 |
488 |
||
750 |
840 |
797 |
736 |
674 |
821 |
753 |
672 |
602 |
795 |
716 |
625 |
547 |
772 |
684 |
584 |
505 |
||
800 |
869 |
825 |
762 |
696 |
850 |
780 |
695 |
622 |
823 |
741 |
646 |
565 |
800 |
707 |
604 |
522 |
||
1000 |
991 |
939 |
864 |
785 |
968 |
882 |
782 |
697 |
933 |
832 |
724 |
631 |
903 |
794 |
675 |
581 |
||
1250 |
1130 |
1067 |
975 |
864 |
1102 |
1000 |
883 |
784 |
1063 |
941 |
816 |
706 |
1026 |
898 |
759 |
650 |
||
1500 |
1250 |
1176 |
1072 |
966 |
1220 |
1105 |
972 |
856 |
1175 |
1037 |
892 |
772 |
1133 |
987 |
828 |
707 |
||
1750 |
1368 |
1282 |
1162 |
1044 |
1330 |
1198 |
1042 |
919 |
1278 |
1124 |
958 |
824 |
1230 |
1063 |
886 |
755 |
||
2000 |
1464 |
1368 |
1233 |
1106 |
1422 |
1274 |
1105 |
970 |
1360 |
1192 |
1013 |
889 |
1308 |
1125 |
935 |
795 |
||
(1.08 at 10°C, 0.92 |
(1.08 at 10°C, 0.92 |
(1.08 at 10°C, 0.92 |
(1.08 at 10°C, 0.92 |
|||||||||||||||
23,000 V |
Copper Temperature 77°C |
Copper Temperature 77°C |
||||||||||||||||
2 |
186 |
181 |
172 |
162 |
184 |
175 |
162 |
150 |
180 |
169 |
154 |
140 |
178 |
164 |
147 |
132 |
||
1 |
214 |
207 |
197 |
186 |
211 |
200 |
185 |
171 |
206 |
193 |
176 |
159 |
203 |
187 |
167 |
150 |
||
0 |
247 |
239 |
227 |
213 |
244 |
230 |
213 |
196 |
239 |
222 |
197 |
182 |
234 |
216 |
192 |
171 |
||
00 |
283 |
273 |
258 |
242 |
278 |
263 |
243 |
221 |
275 |
253 |
225 |
205 |
267 |
245 |
217 |
193 |
||
000 |
326 |
314 |
296 |
277 |
320 |
302 |
276 |
252 |
315 |
290 |
259 |
233 |
307 |
280 |
247 |
220 |
||
0000 |
376 |
362 |
340 |
317 |
367 |
345 |
315 |
288 |
360 |
332 |
297 |
265 |
351 |
320 |
281 |
250 |
||
250 |
412 |
396 |
373 |
346 |
405 |
380 |
346 |
316 |
396 |
365 |
326 |
290 |
386 |
351 |
307 |
272 |
||
300 |
463 |
444 |
416 |
386 |
450 |
422 |
382 |
349 |
438 |
404 |
360 |
319 |
428 |
389 |
340 |
301 |
||
350 |
508 |
488 |
466 |
422 |
493 |
461 |
418 |
380 |
481 |
442 |
393 |
347 |
468 |
424 |
369 |
326 |
||
400 |
548 |
525 |
491 |
454 |
536 |
498 |
451 |
409 |
521 |
478 |
423 |
373 |
507 |
458 |
398 |
349 |
||
500 |
627 |
600 |
559 |
514 |
615 |
570 |
514 |
464 |
597 |
546 |
480 |
423 |
580 |
521 |
450 |
392 |
||
600 |
695 |
663 |
616 |
566 |
684 |
632 |
568 |
511 |
663 |
603 |
529 |
466 |
645 |
577 |
496 |
431 |
||
700 |
765 |
729 |
675 |
620 |
744 |
689 |
617 |
554 |
725 |
656 |
574 |
503 |
703 |
627 |
538 |
467 |
||
750 |
797 |
759 |
702 |
643 |
779 |
717 |
641 |
574 |
754 |
681 |
596 |
527 |
732 |
650 |
558 |
483 |
||
800 |
826 |
786 |
726 |
665 |
808 |
743 |
663 |
595 |
782 |
706 |
617 |
540 |
759 |
674 |
576 |
500 |
||
1000 |
946 |
898 |
827 |
752 |
921 |
842 |
747 |
667 |
889 |
797 |
692 |
603 |
860 |
759 |
646 |
580 |
||
1250 |
1080 |
1020 |
935 |
848 |
1052 |
957 |
845 |
751 |
1014 |
904 |
781 |
676 |
980 |
858 |
725 |
630 |
||
1500 |
1192 |
1122 |
1025 |
925 |
1162 |
1053 |
926 |
818 |
1118 |
993 |
855 |
736 |
1081 |
940 |
791 |
682 |
||
1750 |
1296 |
1215 |
1106 |
994 |
1256 |
1130 |
991 |
875 |
1206 |
1067 |
911 |
785 |
1162 |
1007 |
843 |
720 |
||
2000 |
1390 |
1302 |
1180 |
1058 |
1352 |
1213 |
1053 |
928 |
1293 |
1137 |
967 |
831 |
1240 |
1073 |
893 |
760 |
||
(1.09 at 10°C, 0.90 |
(1.09 at 10°C, 0.90 |
(1.09 at 10°C, 0.90 |
(1.09 at 10°C, 0.90 |
|||||||||||||||
34,500 V |
Copper Temperature 70°C |
Copper Temperature 70°C |
||||||||||||||||
0 |
227 |
221 |
209 |
197 |
225 |
213 |
197 |
182 |
220 |
205 |
187 |
169 |
215 |
199 |
177 |
158 |
||
00 |
260 |
251 |
239 |
224 |
255 |
242 |
224 |
205 |
249 |
234 |
211 |
190 |
245 |
226 |
200 |
179 |
||
000 |
299 |
290 |
273 |
256 |
295 |
278 |
256 |
235 |
288 |
268 |
242 |
217 |
282 |
259 |
230 |
204 |
||
0000 |
341 |
330 |
312 |
291 |
336 |
317 |
291 |
267 |
328 |
304 |
274 |
246 |
321 |
293 |
259 |
230 |
||
250 |
380 |
367 |
345 |
322 |
374 |
352 |
321 |
294 |
364 |
337 |
303 |
270 |
356 |
324 |
286 |
253 |
||
300 |
422 |
408 |
382 |
355 |
416 |
390 |
356 |
324 |
405 |
374 |
334 |
298 |
395 |
359 |
315 |
278 |
||
350 |
464 |
446 |
419 |
389 |
455 |
426 |
388 |
353 |
443 |
408 |
364 |
324 |
432 |
392 |
343 |
302 |
||
400 |
502 |
484 |
451 |
419 |
491 |
460 |
417 |
379 |
478 |
440 |
390 |
347 |
466 |
421 |
368 |
323 |
||
500 |
575 |
551 |
514 |
476 |
562 |
524 |
474 |
429 |
547 |
500 |
442 |
392 |
532 |
479 |
416 |
364 |
||
600 |
644 |
616 |
573 |
528 |
629 |
584 |
526 |
475 |
610 |
556 |
491 |
433 |
593 |
532 |
459 |
401 |
||
700 |
710 |
675 |
626 |
577 |
690 |
639 |
574 |
517 |
669 |
608 |
535 |
470 |
649 |
580 |
500 |
435 |
||
750 |
736 |
702 |
651 |
598 |
718 |
664 |
595 |
535 |
696 |
631 |
554 |
486 |
675 |
602 |
518 |
450 |
||
800 |
765 |
730 |
676 |
620 |
747 |
690 |
617 |
555 |
723 |
654 |
574 |
503 |
700 |
624 |
535 |
465 |
||
1000 |
875 |
832 |
766 |
701 |
852 |
783 |
698 |
624 |
823 |
741 |
646 |
564 |
796 |
706 |
601 |
520 |
||
1250 |
994 |
941 |
864 |
786 |
967 |
882 |
782 |
696 |
930 |
833 |
722 |
628 |
898 |
790 |
670 |
577 |
||
1500 |
1098 |
1036 |
949 |
859 |
1068 |
972 |
856 |
760 |
1025 |
914 |
788 |
682 |
988 |
865 |
730 |
626 |
||
1750 |
1192 |
1123 |
1023 |
925 |
1156 |
1048 |
919 |
814 |
1109 |
984 |
845 |
730 |
1066 |
929 |
780 |
668 |
||
2000 |
1275 |
1197 |
1088 |
981 |
1234 |
1115 |
975 |
860 |
1182 |
1045 |
893 |
770 |
1135 |
985 |
824 |
704 |
||
2500 |
1418 |
1324 |
1196 |
1072 |
1367 |
1225 |
1064 |
936 |
1305 |
1144 |
973 |
834 |
1248 |
1075 |
893 |
760 |
||
(1.10 at 10°C, 0.89 |
(1.10 at 10°C, 0.89 |
(1.10 at 10°C, 0.89 |
(1.10 at 10°C, 0.89 |
|||||||||||||||
46,000 V |
Copper Temperature 65°C |
Copper Temperature 65°C |
||||||||||||||||
000 |
279 |
270 |
256 |
240 |
274 |
259 |
230 |
221 |
268 |
249 |
226 |
204 |
262 |
241 |
214 |
191 |
||
0000 |
322 |
312 |
294 |
276 |
317 |
299 |
274 |
251 |
309 |
287 |
259 |
232 |
302 |
276 |
244 |
217 |
||
250 |
352 |
340 |
321 |
300 |
346 |
326 |
299 |
274 |
336 |
313 |
282 |
252 |
329 |
301 |
266 |
236 |
||
300 |
394 |
380 |
358 |
334 |
385 |
364 |
332 |
304 |
377 |
349 |
313 |
280 |
367 |
335 |
295 |
260 |
||
350 |
433 |
417 |
392 |
365 |
425 |
398 |
364 |
331 |
413 |
382 |
341 |
304 |
403 |
366 |
321 |
283 |
||
400 |
469 |
451 |
423 |
393 |
459 |
430 |
391 |
356 |
446 |
411 |
367 |
326 |
433 |
394 |
344 |
307 |
||
500 |
534 |
512 |
482 |
444 |
522 |
487 |
441 |
400 |
506 |
464 |
412 |
365 |
492 |
444 |
386 |
339 |
||
46,000 V |
Copper Temperature 65°C |
Copper Temperature 65°C |
||||||||||||||||
600 |
602 |
577 |
538 |
496 |
589 |
546 |
494 |
447 |
570 |
520 |
460 |
406 |
553 |
497 |
430 |
377 |
||
700 |
663 |
633 |
589 |
542 |
645 |
598 |
538 |
488 |
626 |
569 |
502 |
441 |
605 |
542 |
468 |
408 |
||
750 |
689 |
658 |
611 |
561 |
672 |
622 |
559 |
504 |
650 |
590 |
520 |
457 |
629 |
562 |
485 |
422 |
||
800 |
717 |
683 |
638 |
583 |
698 |
645 |
578 |
522 |
674 |
612 |
538 |
472 |
652 |
582 |
501 |
436 |
||
1000 |
816 |
776 |
718 |
657 |
794 |
731 |
653 |
585 |
766 |
691 |
604 |
528 |
740 |
657 |
562 |
487 |
||
1250 |
927 |
879 |
810 |
738 |
900 |
825 |
732 |
654 |
865 |
777 |
675 |
589 |
834 |
736 |
626 |
541 |
||
1500 |
1020 |
968 |
887 |
805 |
992 |
904 |
799 |
703 |
951 |
850 |
735 |
638 |
914 |
802 |
679 |
585 |
||
1750 |
1110 |
1047 |
959 |
867 |
1074 |
976 |
859 |
762 |
1028 |
915 |
788 |
682 |
987 |
862 |
726 |
623 |
||
2000 |
1184 |
1115 |
1016 |
918 |
1144 |
1035 |
909 |
805 |
1094 |
970 |
833 |
718 |
1048 |
913 |
766 |
656 |
||
2500 |
1314 |
1232 |
1115 |
1002 |
1265 |
1138 |
994 |
875 |
1205 |
1062 |
905 |
778 |
1151 |
996 |
830 |
708 |
||
(1.11 at 10°C, 0.87 |
(1.11 at 10°C, 0.87 |
(1.11 at 10°C, 0.87 |
(1.11 at 10°C, 0.87 |
|||||||||||||||
69,000 V |
Copper Temperature 60°C |
Copper Temperature 60°C |
||||||||||||||||
350 |
395 |
382 |
360 |
336 |
387 |
364 |
333 |
305 |
375 |
348 |
312 |
279 |
365 |
332 |
293 |
259 |
||
400 |
428 |
413 |
389 |
362 |
418 |
393 |
358 |
328 |
405 |
375 |
335 |
300 |
394 |
358 |
315 |
278 |
||
500 |
489 |
470 |
441 |
409 |
477 |
446 |
406 |
370 |
461 |
425 |
379 |
337 |
447 |
405 |
354 |
312 |
||
600 |
545 |
524 |
490 |
454 |
532 |
496 |
450 |
409 |
513 |
471 |
419 |
371 |
497 |
448 |
391 |
343 |
||
700 |
599 |
573 |
536 |
495 |
582 |
543 |
490 |
444 |
561 |
514 |
455 |
403 |
542 |
489 |
425 |
372 |
||
750 |
623 |
597 |
556 |
514 |
605 |
562 |
508 |
460 |
583 |
533 |
472 |
417 |
563 |
506 |
439 |
384 |
||
800 |
644 |
617 |
575 |
531 |
626 |
582 |
525 |
475 |
603 |
554 |
487 |
430 |
582 |
523 |
453 |
396 |
||
1000 |
736 |
702 |
652 |
599 |
713 |
660 |
592 |
533 |
685 |
622 |
547 |
481 |
660 |
589 |
508 |
442 |
||
1250 |
832 |
792 |
734 |
672 |
806 |
742 |
664 |
595 |
772 |
698 |
610 |
535 |
741 |
659 |
564 |
489 |
||
1500 |
918 |
872 |
804 |
733 |
886 |
814 |
724 |
647 |
848 |
763 |
664 |
580 |
812 |
718 |
612 |
529 |
||
1750 |
994 |
942 |
865 |
788 |
957 |
876 |
776 |
692 |
913 |
818 |
711 |
618 |
873 |
770 |
653 |
563 |
||
2000 |
1066 |
1008 |
924 |
840 |
1020 |
931 |
822 |
732 |
972 |
868 |
750 |
651 |
927 |
814 |
688 |
592 |
||
2500 |
1163 |
1096 |
1001 |
903 |
1115 |
1013 |
892 |
791 |
1060 |
942 |
811 |
700 |
1007 |
880 |
741 |
635 |
||
(1.13 at 10°C, 0.85 |
(1.13 at 10°C, 0.85 |
(1.13 at 10°C, 0.84 |
(1.14 at 10°C, 0.84 |
Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.
a Current ratings are based on the following conditions:
1. Ambient earth temperature = 20°C.
2. 60-cycle alternating current.
3. Sheaths bonded and grounded at one point only (open-circuited sheaths).
4. Standard concentric stranded conductors.
5. Ratings include dielectric loss and skin effect.
6. One cable per duct, all cables equally loaded and in outside ducts only.
b Multiply tabulated values by these factors when earth temperature is other than 20°C.
60 Hz Characteristics of Self-Supporting Rubber-Insulated Neoprene-Jacketed Aerial Cable
Voltage Class |
Conductor Size |
Stranding |
Insulation Thickness |
Shielding |
Jacket Thickness |
Diameter |
Messenger Used with Copper Conductors |
Weight per 1000 ft; Messenger and Copper |
Messenger Used with Aluminum Conductors |
Weight per 1000 ft Messenger and Aluminum |
|||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Positive Sequence 60 ˜ AC Ω/mi |
Zero Sequencec 60 ˜ AC Ω/mi |
||||||||||||||||||
Resistancea |
Reactance |
Resistancea |
Reactance Series Inductive |
||||||||||||||||
Copper |
Aluminum |
Series Inductive |
Shunt Capacitiveb |
Copper |
Aluminum |
Copper |
Aluminum |
Shunt Capacitiveb |
|||||||||||
3 kV ungrounded neutral 5 kV ungrounded neutral |
6 |
7 |
10/4 |
No |
1/4 |
0.59 |
3/4" 30% CCS |
1020 |
3/0"30% CCS |
854 |
2.52 |
4.13 |
0.258 |
— |
3.592 |
5.082 |
3.712 |
3.712 |
— |
4 |
7 |
10/4 |
No |
1/4 |
0.67 |
3/4"30% CCS |
1230 |
3/0"30% CCS |
958 |
1.58 |
2.58 |
0.246 |
— |
2.632 |
3.572 |
3.662 |
3.662 |
||
2 |
7 |
10/4 |
No |
1/4 |
0.73 |
3/4"30% CCS |
1630 |
3/0"30% CCS |
1100 |
1.00 |
1.64 |
0.229 |
— |
2.025 |
2.605 |
3.615 |
3.615 |
— |
|
1 |
19 |
10/4 |
No |
1/4 |
0.77 |
3/4"30% CCS |
1780 |
3/0"30% CCS |
1250 |
0.791 |
1.29 |
0.211 |
— |
1.815 |
2.275 |
3.582 |
3.582 |
— |
|
1/0 |
19 |
10/4 |
No |
1/4 |
0.81 |
3/4"30% CCS |
2070 |
3/0"30% CCS |
1390 |
0.635 |
1.03 |
0.207 |
— |
1.644 |
2.015 |
3.555 |
3.555 |
— |
|
2/0 |
19 |
10/4 |
No |
1/4 |
0.85 |
3/4"30% CCS |
2510 |
3/0"30% CCS |
1530 |
0.501 |
0.816 |
0.200 |
— |
1.622 |
1.803 |
3.162 |
3.526 |
— |
|
3/0 |
19 |
10/4 |
No |
1/4 |
0.91 |
3/4"30% CCS |
2890 |
3/0"30% CCS |
1690 |
0.402 |
0.644 |
0.194 |
— |
1.517 |
1.637 |
3.135 |
3.499 |
— |
|
4/0 |
19 |
10/4 |
No |
1/4 |
0.99 |
3/4"30% CCS |
3570 |
3/0"30% CCS |
1900 |
0.318 |
0.518 |
0.191 |
— |
1.401 |
1.508 |
2.665 |
3.459 |
— |
|
250 |
37 |
11/4 |
No |
1/4 |
1.08 |
3/2"30% CCS |
4080 |
3/0"30% CCS |
2160 |
0.269 |
0.437 |
0.189 |
— |
1.351 |
1.430 |
2.635 |
3.429 |
— |
|
300 |
37 |
11/4 |
No |
1/4 |
1.13 |
3/2"30% CCS |
4620 |
3/0"30% CCS |
2500 |
0.228 |
0.366 |
0.184 |
— |
1.308 |
1.465 |
2.612 |
3.042 |
— |
|
350 |
37 |
11/4 |
No |
1/4 |
1.18 |
3/2"30% CCS |
5290 |
3/0"30% CCS |
2780 |
0.197 |
0.316 |
0.180 |
— |
1.277 |
1.415 |
2.591 |
3.021 |
— |
|
400 |
37 |
11/4 |
No |
1/4 |
1.23 |
3/2"30% CCS |
5800 |
3/0"30% CCS |
3040 |
0.172 |
0.276 |
0.176 |
— |
1.252 |
1.377 |
2.576 |
3.006 |
— |
|
500 |
37 |
11/4 |
No |
1/4 |
1.32 |
3/2"30% CCS |
6860 |
3/0"30% CCS |
3650 |
0.141 |
0.223 |
0.172 |
— |
1.219 |
1.290 |
2.543 |
2.543 |
— |
|
5 kV ungrounded neutral |
6 |
7 |
11/4 |
Yes |
1/4 |
0.74 |
3/2"30% CCS |
1310 |
3/2"30% CCS |
1140 |
2.52 |
4.13 |
0.292 |
4970 |
— |
— |
— |
— |
— |
4 |
7 |
11/4 |
Yes |
1/4 |
0.79 |
3/2"30% CCS |
1540 |
3/2"30% CCS |
1270 |
1.58 |
2.58 |
0.272 |
4320 |
— |
— |
— |
— |
— |
|
2 |
7 |
11/4 |
Yes |
1/4 |
0.88 |
3/2"30% CCS |
1950 |
3/2"30% CCS |
1520 |
1.00 |
1.64 |
0.257 |
3630 |
— |
— |
— |
— |
— |
|
1 |
19 |
11/4 |
Yes |
1/4 |
0.92 |
3/2"30% CCS |
2180 |
3/2"30% CCS |
1640 |
0.791 |
1.29 |
0.241 |
3330 |
— |
— |
— |
— |
— |
|
1/0 |
19 |
11/4 |
Yes |
1/4 |
0.96 |
3/2"30% CCS |
2450 |
3/2"30% CCS |
1770 |
0.655 |
1.03 |
0.233 |
3080 |
— |
— |
— |
— |
— |
|
2/0 |
19 |
11/4 |
Yes |
1/4 |
1.00 |
3/2"30% CCS |
2910 |
3/2"30% CCS |
1930 |
0.501 |
0.816 |
0.223 |
2830 |
— |
— |
— |
— |
— |
|
3/0 |
19 |
11/4 |
Yes |
1/4 |
1.06 |
3/2"30% CCS |
3320 |
3/2"30% CCS |
2120 |
0.402 |
0.644 |
0.215 |
2580 |
— |
— |
— |
— |
— |
|
4/0 |
19 |
11/4 |
Yes |
1/4 |
1.11 |
3/2"30% CCS |
4030 |
3/2"30% CCS |
2350 |
0.318 |
0.518 |
0.207 |
2380 |
— |
— |
— |
— |
— |
|
250 |
37 |
11/4 |
Yes |
1/4 |
1.20 |
3/2"30% CCS |
4570 |
3/2"30% CCS |
2770 |
0.269 |
0.437 |
0.206 |
2380 |
— |
— |
— |
— |
— |
|
300 |
37 |
11/4 |
Yes |
1/4 |
1.29 |
3/2"30% CCS |
5260 |
3/2"30% CCS |
3140 |
0.228 |
0.366 |
0.203 |
2280 |
— |
— |
— |
— |
— |
|
350 |
37 |
11/4 |
Yes |
1/4 |
1.34 |
3/2"30% CCS |
5840 |
3/2"30% CCS |
3380 |
0.197 |
0.316 |
0.199 |
2090 |
— |
— |
— |
— |
— |
|
400 |
37 |
11/4 |
Yes |
1/4 |
1.39 |
3/2"30% CCS |
6380 |
3/2"30% CCS |
3610 |
0.172 |
0.276 |
0.194 |
1890 |
— |
— |
— |
— |
— |
|
500 |
37 |
11/4 |
Yes |
1/4 |
1.47 |
3/2"30% CCS |
7470 |
3/2"30% CCS |
4240 |
0.141 |
0.223 |
0.187 |
1740 |
— |
— |
— |
— |
— |
|
15 kV grounded neutral |
6 |
19 |
11/4 |
Yes |
1/4 |
1.05 |
3/2"30% CCS |
2090 |
3/2"30% CCS |
1920 |
2.52 |
4.13 |
0.326 |
7150 |
3.846 |
5.346 |
3.396 |
3.396 |
7150 |
4 |
19 |
11/4 |
Yes |
1/4 |
1.10 |
3/2"30% CCS |
2350 |
3/2"30% CCS |
2080 |
1.58 |
2.58 |
0.302 |
6260 |
2.901 |
3.831 |
3.364 |
3.364 |
6260 |
|
2 |
19 |
11/4 |
Yes |
1/4 |
1.16 |
3/2"30% CCS |
2860 |
3/2"30% CCS |
2430 |
1.00 |
1.64 |
0.279 |
5460 |
2.459 |
3.039 |
2.851 |
2.851 |
5460 |
|
1 |
19 |
11/4 |
Yes |
1/4 |
1.20 |
3/2"30% CCS |
3120 |
3/2"30% CCS |
2580 |
0.791 |
1.29 |
0.268 |
5110 |
2.238 |
2.701 |
2.837 |
2.837 |
5110 |
|
1/0 |
19 |
11/4 |
Yes |
1/4 |
1.27 |
3/2"30% CCS |
3560 |
3/2"30% CCS |
2880 |
0.655 |
1.03 |
0.260 |
4720 |
2.052 |
2.426 |
2.825 |
2.825 |
4720 |
|
2/0 |
19 |
11/4 |
Yes |
1/4 |
1.32 |
3/2"30% CCS |
4120 |
3/2"30% CCS |
3070 |
0.501 |
0.816 |
0.249 |
4370 |
1.896 |
2.214 |
2.251 |
2.801 |
4370 |
|
3/0 |
19 |
11/4 |
Yes |
1/4 |
1.37 |
3/2"30% CCS |
4580 |
3/2"30% CCS |
3510 |
0.402 |
0.644 |
0.241 |
4120 |
1.782 |
2.008 |
2.240 |
2.240 |
4120 |
|
4/0 |
19 |
11/4 |
Yes |
1/4 |
1.43 |
3/2"30% CCS |
5150 |
3/2"30% CCS |
3790 |
0.318 |
0.518 |
0.231 |
3770 |
1.681 |
1.864 |
2.235 |
2.235 |
3770 |
|
250 |
37 |
11/4 |
Yes |
1/4 |
1.47 |
3/2"30% CCS |
5590 |
3/2"30% CCS |
3980 |
0.269 |
0.437 |
0.223 |
3570 |
1.630 |
1.782 |
2.227 |
2.227 |
3570 |
|
300 |
37 |
11/4 |
Yes |
1/4 |
1.53 |
3/2"30% CCS |
6260 |
3/2"30% CCS |
4330 |
0.228 |
0.366 |
0.217 |
3330 |
1.577 |
1.701 |
2.226 |
2.226 |
3330 |
|
350 |
37 |
11/4 |
Yes |
1/4 |
1.59 |
3/2"30% CCS |
6870 |
3/2"30% CCS |
4600 |
0.197 |
0.316 |
0.212 |
3130 |
1.536 |
1.640 |
2.226 |
2.226 |
3130 |
|
400 |
37 |
11/4 |
Yes |
1/4 |
1.63 |
3/2"30% CCS |
7450 |
3/2"30% CCS |
4860 |
0.172 |
0.276 |
0.208 |
2980 |
1.500 |
1.592 |
2.216 |
2.216 |
2980 |
|
500 |
37 |
11/4 |
Yes |
1/4 |
1.75 |
3/2"30% CCS |
8970 |
3/2"30% CCS |
5560 |
0.141 |
0.223 |
0.204 |
2830 |
1.454 |
1.524 |
2.198 |
2.198 |
2830 |
Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.
a AC resistance based on 65°C with allowance for stranding, skin effect, and proximity effect.
b Dielectric constant assumed to be 6.0.
c Zero sequence impedance based on return current both in the messenger and in 100 mΩ earth.
1. Westinghouse Electric Corporation: Electrical Transmission and Distribution Reference Book, East Pitsburgh, PA, 1964.
2. Westinghouse Electric Corporation: Electric Utility Engineering Reference Book—Distribution Systems. Vol. 3, East Pitsburgh, PA, 1965.
3. Edison Electric Institute: Transmission Line Reference Book, New York, 1968.
4. Anderson, P. M.: Analysis of Faulted Power Systems, Iowa State University Press, Ames, IA, 1973.
5. Westinghouse Electric Corporation: Applied Protective Relaying, Newark, NJ, 1970.
3.144.18.198