Introduction

Application:
General purpose wiring in accordance with the National Electrical Code, maximum conductor temperature of 90°C in dry locations and 75°C in wet locations, 600 volts, for installation in conduit or other recognized raceway. Also used for wiring of machine tools (stranded), appliances, and control circuits not exceeding 600 volts.
Construction:
CU THHN/THWN(-2) conductors are made with soft drawn copper. Sizes 14 through 4/0 AWG use a combination-unilay stranding while 250 kcmil and larger sizes use a compressed copper stranding. The wire is covered with a tough heat and moisture resistant PVC insulation with an overall nylon jacket. Available in black, white, red, blue, purple, green, yellow, orange, brown, and gray. Some colors are subject to economic order quantity.
Standards: ASTMB3, ASTMB8, ASSTMB787, UL83, IEC60227

Technical parameter

UL83

IEC60227

THWN or THHN UL83
THWN or THHN UL83
Size	Conductor			Insulation		Nylon Jacket		Approx. weight
Size	No.of Wires	Dia. of wires	Conductor Dia.	Nominal Thickness	Insulation Dia.	Nominal Thickness	Overall Dia.	Approx. weight
AWG/kcmil	No.	mm	mm	mm	mm	mm	mm	kg/km
14	1	1.63	1.63	0.39	2.41	0.11	2.63	23.4
12	1	2.06	2.06	0.39	2.84	0.11	3.06	35.5
10	1	2.59	2.59	0.51	3.61	0.11	3.83	56
14	7	0.62	1.86	0.39	2.64	0.11	2.86	24.5
12	7	0.78	2.34	0.39	3.12	0.11	3.34	36.7
10	7	0.98	2.94	0.51	3.96	0.11	4.18	57.8
8	7	1.24	3.72	0.77	5.26	0.13	5.52	95.5
6	7	1.56	4.68	0.77	6.22	0.16	6.48	144
4	7	1.96	5.88	1.02	7.92	0.16	8.24	229.2
3	7	2.2	6.6	1.02	8.64	0.16	8.96	282.7
2	7	2.48	7.44	1.02	9.48	0.18	9.8	352.3
1	19	1.69	8.2	1.27	10.74	0.18	11.1	450.7
1/0	19	1.89	9.2	1.27	11.74	0.18	12.1	554.2
2/0	19	2.13	10.34	1.27	12.88	0.18	13.24	692.2
3/0	19	2.39	11.61	1.27	14.15	0.18	14.51	859.5
4/0	19	2.68	13.01	1.27	15.55	0.18	15.91	1067.5
250	37	2.09	14.2	1.53	17.26	0.21	17.68	1280.1
300	37	2.29	15.55	1.53	18.61	0.21	19.03	1521.9
350	37	2.47	16.79	1.53	19.85	0.21	20.27	1757.7
400	37	2.64	17.96	1.53	21.02	0.21	21.44	1996.1
500	37	2.95	20.05	1.53	23.11	0.21	23.53	2469.7
600	61	2.52	22	1.78	25.56	0.23	26.02	2994.7
750	61	2.82	24.64	1.78	28.2	0.23	28.66	3718.1
1000	61	3.25	28.4	1.78	31.96	0.23	32.42	4891.8

Section		Insulation Thickness	Sheath Thickness	Overall Diameter	Cable Weight	Electrical Resistance
No.×mm²	Class of conductor	mm	mm	mm	kg/km	DC.20'C 0/km
2 ×0.75	1	0.6	0.9	4.6×7.1	38.5	24.5
2× 1.0	1	0.6	0.9	4.8×7.4	45	18.1
2 ×1.5	1	0.7	0.9	5.3×8.5	60	12.1
2 × 2.5	1	0.8	1	6.2×10.1	88.5	7.41
2 × 4.0	1	0.8	1	6.7×11.1	122.5	4.61
2×4	7	0.8	1	6.9×11.5	128	4.61
2×6	1	0.8	1.1	7.5×12.5	169	3.08
2×6	7	0.8	1.1	7.8×13	176	3.08
2×10	7	1	1.2	9.5×16.2	282	1.83
3×0.75	1	0.6	0.9	4.9×9.6	55	24.5
3×1	1	0.6	0.9	4.8×10.1	64	18.1
3×1.5	1	0.7	0.9	5.3×11.7	87	12.1
3×2.5	1	0.8	1	6.2×14	128	7.41
3×4	1	0.8	1	7×15.8	183	4.61
3×4	7	0.8	1	7.1×16.3	192	4.61
3×6	1	0.8	1.1	7.5×17.5	247	3.08
3×6	7	0.8	1.1	7.8×18.2	257	3.08
3×10	7	1	1.2	9.5×23	413	1.83

THWN And THHN