Single Conductors - Underground Direct Burial

single conductor cable direct burial

Single conductor cable
direct burial

1/C group buried 36” deep with cables laid on 7-1/2” centers, open circuited shield operation, i.e. shields bonded and grounded at one point only.

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

 

One circuit — three cables

one conductor Copper - direct burial one 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
.........
1250
.........
1500
.........
1750
.........
2000.....
....

108.........
139
.........
180
.........
231
.........
261
.........
297
.........
337
.........
384
.........
434
.........
472
.........
569
.........
690
.........
847
.........
980
.........
1083
.........
1176
.........
1257
.........
1325
.........

110...
140
...
180
...
230
...
260
...
295
...
335
...
385
...
435
...
470
...
570
...
690
...
845
...
980
...
1085
...
1175
...
1255
...
1325
...

.115...
150
...
195
...
250
...
280
...
320
...
365
...
415
...
465
...
510
...
615
...
745
...
910
...
1055
...
1165
...
1265
...
1355
...
1430
...

...
130
...
170
...
210
...
240
...
275
...
310
...
355
...
405
...
440
...
535
...
650
...
805
...
930
...
1035
...
1125
...
1200
...
1265
...

...
140
...
180
...
225
...
260
...
295
...
335
...
380
...
435
...
475
...
575
...
700
...
865
...
1005
...
1115
...
1210
...
1295
...
1365
...

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)

84.........
108.........
140.........
180.........
203.........
231.........
263.........
299.........
338.........
368.........
444.........
540.........
667.........
778.........
868.........
952.........
1027.........
1094.........

85...
110
...
140
...
180
...
205
...
230
...
265
...
300
...
340
...
370
...
445
...
540
...
665
...
780
...
870
...
950
...
1025
...
1095
...

90...
115
...
150
...
195
...
220
...
250
...
285
...
320
...
365
...
395
...
480
...
580
...
720
...
840
...
935
...
1025
...
1105
...
1180
...

.......
110
...
130
...
165
...
185
...
215
...
245
...
275
...
315
...
345
...
415
...
510
...
635
...
740
...
830
...
910
...
980
...
1045
...

...
110
...
140
...
175
...
200
...
230
...
260
...
295
...
340
...
370
...
450
...
545
...
680
...
795
...
895
...
980
...
1060
...
1130
...

 

single conductor cable direct burial

Single conductor cable
direct burial

1/C group buried 36” deep with cables laid on 7-1/2” centers, second circuit similarly spaced. Groups separated 24", open circuited shield operation, i.e. shields bonded and grounded at one point only.

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

 

Two circuits — six cables

one conductor Copper - direct burial one 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.........
1250.........
1500.........
1750.........
2000.........

101.........
130.........
167.........
214.........
241.........
275.........
311.........
354.........
399.........
435.........
522.........
631.........
773.........
892.........
985.........
1068.........
1140.........
1200.........

100...
130...
165...
215...
240...
275...
310...
355...
400...
435...
520...
630...
775...
890...
985...
1070...
1140...
1200...

.110...
140...
180...
230...
260...
295...
335...
380...
430...
470...
560...
680...
835...
960...
1060...
1150...
1230...
1295...

...
120...
160...
195...
225...
255...
290...
330...
375...
410...
495...
600...
740...
855...
945...
1025...
1095...
1150...

...
130...
170...
210...
240...
275...
315...
355...
405...
440...
530...
645...
795...
920...
1020...
1105...
1180...
1240...

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)

79.........
101
.........
130
.........
167
.........
188
.........
214
.........
243
.........
276
.........
311
.........
339
.........
408
.........
494
.........
609
.........
708
.........
790
.........
865
.........
932
.........
991
.........

80...
100
...
130
...
165
...
190
...
215
...
245
...
275
...
310
...
340
...
410
...
495
...
610
...
710
...
790
...
865
...
930
...
990
...

85...
110
...
140
...
180
...
200
...
230
...
260
...
295
...
335
...
365
...
440
...
530
...
655
...
765
...
851
...
930
...
1005
...
1070
...

...
95
...
125
...
155
...
175
...
200
...
225
...
255
...
290
...
320
...
385
...
470
...
580
...
680
...
760
...
830
...
895
...
950
...

...
100...
130
...
165
...
190
...
215
...
245
...
275
...
315
...
345
...
415
...
505
...
625
...
730
...
820
...
895
...
965
...
1025
...