3 Conductor - Underground Direct Burial

Single conductor cable direct burial

Three conductor cable
direct burial

Cables buried 36” deep. For two cables, currents based on cables being laid on 24” centers.

Earth ambient temperature 20°C
Earth thermal resistivity RHO 90.
100% load factor

 

One circuit — one cable

Three conductor
Copper - direct burial
Three conductor
Aluminum - direct burial

Conductor
Size
AWG-kcmil

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

8.........
.
6
.........
4
.........
2
.........
1
.........
1/0
.........
2/0
.........
3/0
.........
4/0
.........
250
.........
350
.........
500
.........
750
.........
1000
........\

83.........
106
.........
137
.........
178
.........
201
.........
229
.........
260
.........
297
.........
335
.........
367
.........
442
.........
531
.........
648
.........
729
.........

85...
105
...
135
...
180
...
200
...
230
...
260
...
295
...
335
...
365
...
440
...
530
...
650
...
730
...

89...
115
...
150
...
190
...
215
...
245
...
280
...
320
...
360
...
395
...
475
...
570
...
700
...
785
...

...
115
...
145
...
185
...
210
...
240
...
270
...
305
...
350
...
380
...
460
...
550
...
665
...
750
...

...
120
...
155
...
200
...
225
...
255
...
290
...
330
...
375
...
410
...
495
...
590
...
720
...
810
...

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

65.........
82
.........
107
.........
138
.........
156
.........
178
.........
203
.........
231
.........
262
.........
287
.........
347
.........
420
.........
522
.........
602
.........

65...
80
...
105
...
140
...
155
...
180
...
205
...
230
...
260
...
285
...
345
...
420
...
520
...
600
...

70...
88
...
115
...
150
...
170
...
190
...
220
...
250
...
280
...
310
...
375
...
450
...
560
...
650
...

...
90
...
115
...
145
...
165
...
185
...
210
...
240
...
270
...
300
...
360
...
435
...
540
...
620
...

...
95
...
125
...
155
...
175
...
200
...
225
...
260
...
295
...
320
...
390
...
470
...
580
...
665
...

 

Two circuits — two cables

Three conductor
Copper - direct burial
Three conductor
Aluminum - direct burial

Conductor
Size
AWG-kcmil

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

8.........
.
6
.........
4
.........
2
.........
1
.........
1/0
.........
2/0
.........
3/0
.........
4/0
.........
250
.........
350
.........
500
.........
750
.........
1000
........\

78.........
99
.........
129
.........
166
.........
187
.........
213
.........
242
.........
275
.........
311
.........
340
.........
408
.........
488
.........
593
.........
666
.........

80...
100
...
130
...
165
...
185
...
215
...
240
...
275
...
310
...
340
...
410
...
490
...
595
...
665
...

84...
105
...
140
...
180
...
200
...
230
...
260
...
295
...
335
...
365
...
440
...
525
...
640
...
715
...

...
105
...
135
...
170
...
195
...
220
...
250
...
280
...
320
...
350
...
420
...
500
...
605
...
675
...

...
115
...
145
...
185
...
210
...
235
...
270
...
305
...
345
...
375
...
450
...
535
...
650
...
730
...

Non-Shielded

Shielded

600-2000 Volts
Ampacity

2001-5000 Volts
Ampacity

5001-35000 Volts
Ampacity

90° C
(194°F)

90° C
(194°F)

105°C
(221°F)

90° C
(194°F)

105°C
(221°F)

61.........
77
.........
100
.........
129
.........
146
.........
166
.........
189
.........
215
.........
243
.........
266
.........
320
.........
386
.........
478
.........
550
.........

60...
75
...
100
...
130
...
145
...
165
...
190
...
215
...
245
...
265
...
320
...
385
...
480
...
550
...

66...
83
...
110
...
140
...
155
...
180
...
205
...
230
...
260
...
285
...
345
...
415
...
515
...
590
...

...
80
...
105
...
135
...
150
...
170
...
195
...
220
...
250
...
275
...
330
...
395
...
485
...
560
...

...
88
...
115
...
145
...
165
...
185
...
210
...
240
...
270
...
295
...
355
...
425
...
525
...
600
...