Nickel-Chromium Heater Wire - Temperature Rise vs. Amps

Electric resistance vs. temperature rise for Nickel-Chromium electrical heater wire. Provides SWG gauge sizes with corresponding diameter, resistance, and current ratings for different temperature rises (500°C and 1000°C).

SWG	Diameter (mm)	Diameter (in)	Nickel-Chromium (ohm/m)	Current (A) @ 500°C	Current (A) @ 1000°C
12	2.642	0.104	0.197	38	78
14	2.032	0.08	0.333	26	53
16	1.626	0.064	0.52	19	40
18	1.219	0.048	0.92	13	27
20	0.914	0.036	1.65	8.5	18
22	0.711	0.028	2.72	6.3	13
24	0.559	0.022	4.4	4.5	9.5
26	0.457	0.018	6.6	3.5	7
28	0.376	0.0148	9.7	2.7	5.5
30	0.315	0.0124	13.9	2.2	4.5
32	0.274	0.0108	18.3	1.9	3.5
34	0.234	0.0092	25.2	1.6	3
36	0.193	0.0076	37	1.3	2.3
38	0.152	0.006	59	1	1.7
40	0.122	0.0048	92	0.8	1.4
42	0.102	0.004	133	0.65	1.1
44	0.0813	0.0032	208	N/A	N/A
46	0.061	0.0024	370	N/A	N/A
48	0.0406	0.0016	835	N/A	N/A
50	0.0254	0.001	2130	N/A	N/A