Adaptation of Table 310.16 to Metric Sizes and 70°C Temperature Rating
Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts
Not More Than Three Current-Carrying Conductors in Raceway, Cable,
or Earth (Directly Buried). Based on Ambient Temperature of 30°C (86°F)
Adaptation by Clas-Henrik Gustafsson, 4 Aug 2004.
This page is for comparisons only. DO NOT USE!
			Copper
	AWG	Temperature rating [°C]
	kcmil	60	70	75	90	mm²
	18	(10)	(11)	(12)	(14)
		(11)	(13)	(14)	(16)	1,0
	16	(13)	(15)	(16)	(18)
		(15)	(17)	(17)	(20)	1,5
	14	20	20	20	25
		20	20	20	25	2,5
	12	25	25	25	30
		25	30	30	35	4,0
	10	30	35	35	40
		30	35	40	45	6,0
	8	40	45	50	55
		45	50	55	60	10
	6	55	60	65	75
		60	65	70	80	16
	4	70	80	85	95
		80	90	95	110	25
	3	85	90	100	110
	2	95	105	115	130
		95	110	115	130	35
	1	110	125	130	150
		120	135	145	165	50
	1/0	125	140	150	170
	2/0	145	165	175	195
		150	165	175	200	70
	3/0	165	190	200	225
		180	200	210	240	95
	4/0	195	215	230	260
		205	230	245	280	120
	250	215	240	255	290
	300	240	270	285	320	150
	350	260	295	310	350
		265	295	315	355	185
	400	280	315	335	380
		310	350	365	415	240
	500	320	355	380	430
	600	355	395	420	475	300
	700	385	430	460	520
	750	400	445	475	535
	800	410	460	490	555	400
	900	435	490	520	585
	1000	455	515	545	615	500
			Aluminum
	AWG	Temperature rating [°C]
	kcmil	60	70	75	90	mm²
		(16)	(18)	(19)	(20)	2,5
	12	(20)	(20)	(20)	(25)
		(20)	(20)	(25)	(25)	4,0
	10	(25)	(25)	(30)	(35)
		(25)	(30)	(30)	(35)	6,0
	8	30	35	40	45
		35	40	40	50	10
	6	40	45	50	60
		45	50	55	65	16
	4	55	60	65	75
		60	70	75	85	25
	3	65	70	75	85
	2	75	80	90	100
		75	85	90	105	35
	1	85	95	100	115
		95	105	110	130	50
	1/0	100	110	120	135
	2/0	115	125	135	150
		115	130	135	155	70
	3/0	130	145	155	175
		140	155	165	190	95
	4/0	150	170	180	205
		160	185	195	220	120
	250	170	195	205	230
	300	190	215	230	255	150
	350	210	235	250	280
		215	245	255	285	185
	400	225	255	270	305
		250	285	300	335	240
	500	260	295	310	350
	600	285	320	340	385	300
	700	310	355	375	420
	750	320	365	385	435
	800	330	375	395	450	400
	900	355	400	425	480
	1000	375	420	445	500	500
Correction Factors for Ambient Temperature
For copper and aluminum, base temperature 30°C
Ambient Temp.			Temperature Rating [°C]
°C	°F		60	70	75	90
21-25	70-77		1,08	1,06	1,05	1,04
26-30	78-86		1,00	1,00	1,00	1,00
31-35	87-95		0,91	0,94	0,94	0,96
36-40	96-104		0,82	0,87	0,88	0,91
41-45	105-113		0,71	0,79	0,82	0,87
46-50	114-122		0,58	0,71	0,75	0,82
51-55	123-131		0,41	0,61	0,67	0,76
56-60	132-140			0,50	0,58	0,71
61-65	142-149			0,35	0,47	0,65
66-70	150-158				0,33	0,58
71-80	159-176					0,41
The interval 61-65C (142-149F) does not exist in the NEC.
It has been calculated.
Adaptation of Table 310.20 to Metric Sizes and 70°C Temperature Rating
Ampacities of Not More Than Three Single Insulated Conductors,
Rated 0 Through 2000 Volts, Supported on a Messenger,
Based on Ambient Air Temperature of 40°C (104°F)
			Copper
	Temperature rating [°C]
AWG/kcmil		70	75	90	mm²
	8	53	57	66
		58	62	73	10
	6	71	76	89
		78	84	98	16
	4	94	101	117
		104	112	131	25
	3	110	118	138
	2	126	135	158
		130	140	163	35
	1	147	158	185
		163	176	205	50
	1/0	170	183	214
	2/0	197	212	247
		203	218	254	70
	3/0	228	245	287
		246	265	310	95
	4/0	267	287	335
		287	309	361	120
	250	298	320	374
	300	334	359	419	150
	350	369	397	464
		378	406	475	185
	400	400	430	503
		446	479	560	240
	500	461	496	580
	600	514	553	647	300
	700	567	610	714
	750	593	638	747
	800	614	660	773	400
	900	655	704	826
	1000	696	748	879	500
			Aluminum
	Temperature rating [°C]
AWG/kcmil		70	75	90	mm²
	8	41	44	51
		45	48	56	10
	6	55	59	69
		60	65	76	16
	4	73	78	91
		81	87	102	25
	3	86	92	107
	2	99	106	123
		100	108	127	35
	1	114	123	144
		127	136	160	50
	1/0	133	143	167
	2/0	153	165	193
		158	170	199	70
	3/0	179	192	224
		192	207	242	95
	4/0	208	224	262
		225	241	281	120
	250	233	251	292
	300	262	282	328	150
	350	290	312	364
		297	320	374	185
	400	315	339	395
		352	378	442	240
	500	365	392	458
	600	409	440	514	300
	700	454	488	570
	750	476	512	598
	800	495	532	622	400
	900	532	572	669
	1000	569	612	716	500
Correction Factors for Ambient Temperature
For copper and aluminum, base temperature 40°C
Ambient Temp.			Temperature Rating [°C]
°C	°F		70	75	90
21-25	70-77		1,22	1,20	1,14
26-30	78-86		1,15	1,13	1,10
31-35	87-95		1,08	1,07	1,05
36-40	96-104		1,00	1,00	1,00
41-45	105-113		0,91	0,93	0,95
46-50	114-122		0,82	0,85	0,89
51-55	123-131		0,71	0,76	0,84
56-60	132-140		0,58	0,65	0,77
61-65	142-149		0,41	0,53	0,71
66-70	150-158			0,38	0,63
71-80	159-176				0,45
The interval 61-65C (142-149F) does not exist in the NEC.
It has been calculated.