okonite wire and cable - Single conductor underground ducts
Ampacity Tables
Single Conductor
Underground Ducts

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Single conductor cable underground ducts

Single conductor cable
underground ducts

Open circuited shield operation, i.e. shields bonded and grounded at one point only.

One cable per non-metallic duct, all
cables equally loaded and in outside ducts only.

Earth ambient temperature 20°C
Earth thermal resistivity RHO 90
100% Load Factor

Depth of burial - 30” to top of duct bank with ducts on 7 1/2“ centers.

 

One circuit — three cables in separate ducts
one conductor Copper - underground ducts one conductor Aluminum - underground ducts

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.........

80.........
104.........
135.........
176.........
202.........
231.........
264.........
301.........
345.........
379.........
461.........
564.........
706.........
823.........
920.........
1004.........
1077.........
1139.........

80...
106...
137...
178...
204...
233...
265...
302...
345...
379...
460...
561...
702...
816...
913...
995...
1066...
1125...

86...
114...
148...
192...
220...
251...
286...
326...
372...
409...
496...
605...
757...
880...
984...
1073...
1149...
1213...

—...
106...
137...
179...
204...
232...
265...
302...
344...
378...
457...
557...
695...
807...
902...
981...
1051...
1109...

..—...
114...
148...
193...
220...
250...
286...
326...
371...
407...
493...
600...
749...
870...
972...
1058...
1133...
1196...

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)

62.........
81.........
105.........
137.........
157.........
180.........
205.........
235.........
269.........
296.........
360.........
442.........
556.........
653.........
738.........
813.........
880.........
940.........

62...
83...
107...
139...
159...
181...
206...
236...
269...
296...
359...
440...
553...
648...
732...
806...
872...
930...

67...
89...
115...
150...
171...
195...
222...
254...
290...
319...
387...
474...
596...
699...
789...
869...
940...
1003...

....—...
83...
107...
139...
159...
181...
206...
235...
268...
295...
357...
436...
547...
641...
723...
795...
859...
917...

—...
89...
115...
150...
171...
195...
222...
253...
289...
318...
385...
470...
590...
691...
779...
857...
926...
989...

 

Two circuits — six cables in separate ducts
one conductor Copper - underground ducts one conductor Aluminum - underground ducts

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.........

71.........
93.........
120.........
155.........
176.........
201.........
226.........
260.........
296.........
325.........
391.........
475.........
589.........
682.........
759.........
824.........
880.........
928.........

71...
94...
121...
156...
177...
202...
229...
260...
296...
324...
390...
472...
585...
676...
752...
816...
871...
916...

77...
101...
130...
168...
191...
218...
247...
280...
319...
349...
420...
509...
631...
729...
811...
880...
939...
987...

—...
94...
121...
156...
177...
201...
228...
259...
294...
322...
387...
468...
579...
668...
742...
804...
858...
902...

—...
101...
130...
168...
191...
217...
246...
279...
317...
347...
417...
505...
624...
720...
800...
867...
925...
972...

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)

56.........
72.........
93.........
121.........
138.........
157.........
178.........
203.........
231.........
253.........
306.........
372.........
464.........
541.........
608.........
667.........
719.........
766.........

56...
73...
94...
121...
138...
157...
178...
203...
231...
253...
304...
370...
461...
537...
603...
661...
712...
757...

60...
79...
101...
130...
149...
169...
192...
219...
249...
273...
328...
399...
497...
579...
650...
713...
768...
816...

—...
73...
94...
121...
138...
157...
178...
202...
230...
251...
302...
367...
456...
530...
595...
651...
702...
746...

—...
79...
101...
130...
149...
169...
192...
218...
248...
271...
326...
396...
492...
571...
641...
702...
757...
804...

 

Three circuits — nine cables in separate ducts
one conductor Copper - underground ducts one conductor Aluminum - underground ducts

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.........

68.........
87.........
112.........
145.........
165.........
188.........
213.........
242.........
275.........
301.........
362.........
438.........
541.........
625.........
694.........
752.........
803.........
845.........

68...
88...
114...
146...
166...
188...
213...
242...
274...
300...
360...
435...
537...
619...
687...
744...
794...
834...

73...
95...
123...
157...
179...
203...
230...
261...
295...
323...
388...
469...
579...
667...
741...
802...
856...
899...

—...
88...
114...
146...
165...
188...
212...
241...
273...
298...
357...
431...
531...
611...
678...
733...
781...
821...

—...
95...
123...
157...
178...
203...
229...
260...
294...
321...
385...
465...
572...
659...
731...
790...
842...
885...

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)

53.........
68.........
88.........
113.........
129.........
146.........
166.........
188.........
214.........
235.........
282.........
343.........
426.........
496.........
556.........
609.........
656.........
698.........

53...
69...
88...
114...
129...
147...
166...
188...
214...
234...
281...
341...
423...
492...
551...
603...
649...
689...

57...
74...
95...
123...
139...
158...
179...
203...
231...
252...
303...
368...
456...
530...
594...
650...
700...
743...

—...
69...
88...
113...
129...
146...
165...
188...
213...
233...
279...
337...
418...
485...
544...
594...
639...
678...

—...
74...
95...
122...
139...
157...
178...
203...
230...
251...
301...
363...
451...
523...
586...
640...
689...
731...

 

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