(转)Wire Sizing and Ampacities Charts

Wire Sizing and Ampacities Charts

12 Volt 2% Wire Loss Chart

Maximum distance one-way in feet of various gauge two conductor copper wire from power source to load for 2% voltage drop in a 12 volt system. You can go twice the distance where a 4% loss is acceptable. Do not exceed the 2% drop for wire between PV modules and batteries. A 4 to 5% loss is acceptable between batteries and lighting circuits in most cases. Multiply distances by 2 for 24 volts and by 4 for 48 volts.

2% Voltage Drop Chart
Amps	#14	#12	#10	#8	#6	#4	#2	#1/0	#2/0	#4/0
1	45	70	115	180	290	456	720	.	.	.
2	22.5	35	57.5	90	145	228	360	580	720	1060
4	10	17.5	27.5	45	72.5	114	180	290	360	580
6	7.5	12	17.5	30	47.5	75	120	193	243	380
8	5.5	8.5	11.5	22.5	35.5	57	90	145	180	290
10	4.5	7	11.5	18	28.5	45.5	72.5	115	145	230
15	3	4.5	7	12	19	30	48	76.5	96	150
20	2	3.5	5.5	9	14.5	22.5	36	57.5	72.5	116
25	1.8	2.8	4.5	7	11.5	18	29	46	58	92
30	1.5	2.4	3.5	6	9.5	15	24	38.5	48.5	77
40	.	.	2.8	4.5	7	11.5	18	29	36	56
50	.	.	2.3	3.6	5.5	9	14.5	23	29	46
100	.	.	.	.	2.9	4.6	7.2	11.5	14.5	23
150	.	.	.	.	.	.	4.8	7.7	9.7	15
200	.	.	.	.	.	.	3.6	5.8	7.3	11

Maximum Ampacities for Wire

Allowable ampacities of conductors (wires) in conduit, raceway, cable or directly buried, based on ambient temperature of 86