Conductor Ampacity of AL

As a solar system is designed you need to select the correct size conductor. The following tables will help in that selection. This information is based on the following:

• National Electric Code (NEC) Table 310.16
• Conductors rated 0 to 2000 V
• Not more than 3 current carrying conductors in raceway, cable or direct buried
• Ambient Temp 30C (86F)

Allowable Ampacity of Aluminum Conductors

Size AWG or kcmil	Conductor Temp 60C (140F)	Conductor Temp 75C (167F)	Conductor Temp 90C (194F)
12*	20	20	25
10*	25	30	35
8	30	40	45
6	40	50	60
4	55	65	75
3	65	75	85
2	75	90	100
1	85	100	115
1/0	100	120	135
2/0	115	135	150
3/0	130	155	175
4/0	150	180	205
250	170	205	230
300	190	230	255
350	210	250	280
400	225	270	305
500	260	310	350

12 AWG Maximum overcurrent = 15 amps
10 AWG Maximum overcurrent = 25 amps

Correction Factors for Different Ambient Temperatures

Ambient Temperature (C)	Conductor Temp 60C (140F)	Conductor Temp 75C (167F)	Conductor Temp 90C (194F)	Ambient Temperature (F)
21-25	1.08	1.05	1.04	70-77
26-30	1	1	1	78-86
31-35	0.91	0.94	0.96	87-95
36-40	0.82	0.88	0.91	96-104
41-45	0.71	0.82	0.87	105-113
46-50	0.58	0.75	0.82	114-122
51-55	0.41	0.67	0.76	123-131
56-60	0	0.58	0.71	132-140
61-70	0	0.33	0.58	141-158
71-80	0	0	0.41	159-179