Okonite Ampacity Tables: Three Conductor Cable Underground Ducts

Ampacity Tables
Three Conductor
Underground Ducts

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3 conductor cable underground ducts

Three conductor cable
underground ducts

One cable per 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 duct on 7 1/2 centers.

One circuit — one cable in duct bank

Three conductor
Copper - underground ducts

Three 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........\	59......... 78......... 102......... 133......... 154......... 177......... 202......... 231......... 264......... 292......... 354......... 429......... 529......... 599.........	59... 78... 100... 135... 155... 175... 200... 230... 265... 290... 355... 430... 530... 600...	64... 84... 110... 145... 165... 190... 220... 250... 285... 315... 380... 460... 570... 645...	—... 88... 115... 150... 170... 195... 220... 250... 285... 310... 375... 450... 545... 615...	—... 95... 125... 160... 185... 210... 235... 270... 305... 335... 400... 485... 585... 660...

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)
46......... 61......... 80......... 104......... 120......... 138......... 158......... 180......... 206......... 228......... 278......... 340......... 426......... 495.........	46... 61... 80... 105... 120... 140... 160... 180... 205... 230... 280... 340... 425... 495...	50... 66... 86... 110... 130... 150... 170... 195... 220... 245... 310... 365... 460... 535...	—... 69... 89... 115... 135... 150... 170... 195... 220... 245... 295... 355... 440... 510...	—... 74... 96... 125... 145... 165... 185... 210... 240... 265... 315... 385... 475... 545...

Three circuits — three cables in duct bank

Three conductor
Copper - underground ducts

Three 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.........	53......... 69......... 89......... 116......... 133......... 151......... 172......... 196......... 223......... 245......... 294......... 354......... 430......... 484.........	53... 69... 89... 115... 135... 150... 170... 195... 225... 245... 295... 355... 430... 485...	57... 74... 96... 125... 145... 165... 185... 210... 240... 265... 315... 380... 465... 520...	—... 75... 97... 125... 140... 160... 185... 205... 230... 255... 305... 360... 430... 485...	—... 81... 105... 135... 155... 175... 195... 220... 250... 270... 325... 385... 465... 515...

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)
41......... 54......... 70......... 90......... 103......... 118......... 135......... 153......... 174......... 191......... 231......... 280......... 347......... 399.........	41... 54... 70... 90... 105... 120... 135... 155... 175... 190... 230... 280... 345... 400...	44... 58... 75... 97... 110... 125... 145... 165... 185... 205... 250... 300... 375... 430...	—... 59... 75... 100... 110... 125... 140... 160... 180... 200... 240... 285... 350... 400...	—... 64... 81... 105... 120... 135... 155... 175... 195... 215... 255... 305... 375... 430...

Six circuits — six cables in duct bank

Three conductor
Copper - underground ducts

Three 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.........	46......... 70......... 77......... 98......... 112......... 127......... 144......... 163......... 185......... 202......... 242......... 289......... 348......... 390.........	46... 60... 77... 98... 110... 125... 145... 165... 185... 200... 240... 290... 350... 390...	50... 65... 83... 105... 120... 135... 155... 175... 200... 220... 270... 310... 375... 420...	—... 63... 81... 105... 115... 130... 150... 170... 190... 205... 245... 290... 340... 380...	—... 68... 87... 110... 125... 145... 160... 180... 200... 220... 275... 305... 365... 405...

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)
36......... 46......... 60......... 77......... 87......... 99......... 112......... 128......... 144......... 158......... 190......... 228......... 281......... 322.........	36... 46... 60... 77... 87... 99... 110... 130... 145... 160... 190... 230... 280... 320...	39... 50... 65... 83... 94... 105... 120... 140... 155... 170... 205... 245... 305... 345...	—... 49... 63... 80... 90... 105... 115... 130... 150... 160... 190... 230... 275... 315...	—... 53... 68... 86... 98... 110... 125... 140... 160... 170... 205... 245... 295... 335...

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