Conductor Resistance

The conductor class acc. to IEC 60228 (DIN VDE 0295) refers to the flexibility of the conductor.

There is no correspondence between the conductor class and its intended use.

Certain finely stranded cables, for example, are exclusively intended for fixed, unmoved installation (e.g. car, ship or airplane construction).

Class	Construction		Type key for
			Power cable DIN VDE 0271/0276	harmonised cables
1	solid conductor	e.g. round-solid or sector-shaped-solid	re, se	-U, -W
2	stranded conductor	e.g. round-stranded or sector-shaped-stranded	rm, sm	-R, -S
5	finely stranded conductor	colloquial „flexible“	(f)	-K, -F, -D
6	extra-finely stranded conductor	colloquial „highly flexible“	(ff)	-H, -E

Conductor resistance at 20°C

	Copper conductor, bare		Copper conductor, tinned		Aluminium conductor (or alloy)
nominal cross section mm²	Class 1 + 2 Ω/km	Class 5 + 6 Ω/km	Class 1 + 2 Ω/km	Class 5 + 6 Ω/km	Class 1 + 2 Ω/km
0,5	36,0	39,0	36,7	40,1	–
0,75	24,5	26,0	24,8	26,7	–
1,0	18,1	19,5	18,2	20,0	–
1,5	12,1	13,3	12,2	13,7	–
2,5	7,41	7,98	7,56	8,21	–
4	4,61	4,95	4,7	5,09	–
6	3,08	3,3	3,11	3,39	–
10	1,83	1,91	1,84	1,95	3,08
16	1,15	1,21	1,16	1,24	1,91
25	0,727	0,78	0,734	0,795	1,20
35	0,524	0,554	0,529	0,565	0,868
50	0,387	0,386	0,391	0,393	0,641
70	0,268	0,272	0,27	0,277	0,443
95	0,193	0,206	0,195	0,21	0,320
120	0,153	0,161	0,154	0,164	0,253
150	0,124	0,129	0,126	0,132	0,206
185	0,0991	0,106	0,1	0,108	0,164
240	0,0754	0,0801	0,0762	0,0817	0,125
300	0,0601	0,0641	0,0607	0,0654	0,100
400	0,047	0,0486	0,0475	0,0495	0,0778
500	0,0366	0,0384	0,0369	0,0391	0,0605
630	0,0283	0,0287	0,0286	0,0292	0,0469