series NF

Nominal cross-section (mm²)	Electrical resistance in D.C. at 20°C (Ohm/km)	Electrical resistance in C.C. at 70°C (Ohm/km)	Inductive reactance at 50Hz (Ohm/Km)
			1 Conductor (1)	1 Conductor (2)	1 Conductor (3)	Multiconductor (4)	4 Conductors (5)
1	19.5	23.33	0.169	0.212	0.154	0.111	0.119
1.5	13.3	15.91	0.159	0.202	0.144	0.104	0.112
2.5	7.98	9.55	0.147	0.191	0.33	0.097	0.104
4	4.95	5.92	0.142	0.186	0.128	0.097	0.104
6	3.3	3.95	0.133	0.176	0.118	0.091	0.098
10	1.91	2.29	0.122	0.166	0.108	0.084	0.092
16	1.21	1.45	0.116	0.159	0.101	0.08	0.088
25	0.78	0.93	0.112	0.156	0.097	0.08	0.087
35	0.554	0.663	0.108	0.152	0.093	0.078	0.085
50	0.386	0.462	0.105	0.149	0.091	0.077	0.085
70	0.272	0.326	0.101	0.144	0.086	0.074	0.082
95	0.206	0.248	0.099	0.143	0.085	0.074	0.081
120	0.161	0.194	0.097	0.141	0.083	0.072	0.08
150	0.129	0.156	0.096	0.14	0.082	0.072	0.08
185	0.106	0.129	0.096	0.14	0.082	0.072	0.08
240	0.0801	0.0993	0.095	0.138	0.08	0.072	0.079
300	0.0641	0.081	0.094	0.137	0.079	0.071	0.079
400	0.0486	0.0637	0.093	0.136	0.078	--	--
500	0.0384	0.0527	0.092	0.135	0.077	--	--
630	0.0287	0.0429	0.09	0.134	0.076	--	--

(1) Three single conductor cables displayed in flat, in contact with each other. (2) Three single conductor cables displayed in flat, separated by 1 diameter between each other. (3) Three single-conductor cables displayed in a trefoil in contact with each other. (4) Calculation of Inductive reactance valid for two-conductor and three conductor cables. (5) Calculation of Inductive reactance valid for four-conductor cables.

Nominal cross-section (mm²)	Current-carrying capacity of cables in free air at 40°C as per IEC 364-5-523.Single-conductors cable up to 16mm² in contact with each other, displayed in unperforated trays, remaining cross-sections, single-conductors displays and formations in cable ladder or perforated cable trays (Amper)					Current-carrying capacity of cables directly buried at 25°C soil temperature and soil thermal resistance of 1 km/W as per IEC 364-5-523 (Amper)
	1 Conductor (1)	1 Conductor (2)	1 Conductor (3)	2 Conductors	Multiconductor (4)	1 Conductor (1)	1 Conductor (2)	2 Conductors	Multiconductor (4)
1	--	--	--	--	--	--	--	--	--
1.5	14.4	--	--	18.1	15.3	28	29	28	24
2.5	20	--	--	25	21	37	40	37	32
4	27	--	--	33	29	48	51	48	42
6	34	--	--	42	35	60	64	62	52
10	48	--	--	58	49	80	85	84	70
16	63	--	--	78	67	103	110	106	90
25	94	121	91	98	84	133	142	137	117
35	118	149	113	123	105	160	171	164	140
50	143	181	138	149	126	186	199	197	164
70	186	232	179	192	162	230	246	241	200
95	227	282	219	233	197	276	295	291	241
120	265	328	255	271	228	314	335	333	276
150	308	377	295	314	263	352	376	373	309
185	352	430	338	358	301	398	426	423	351
240	419	508	401	425	355	464	496	493	407
300	485	586	464	490	410	525	562	558	460
400	569	704	542	--	--	600	642	--	--
500	652	811	619	--	--	695	744	--	--
630	748	941	707	--	--	796	852	--	--

(1) Three single conductor cables displayed in flat, in contact with each other. (2) Three single conductor cables displayed in flat, separated by 1 diameter between each other. (3) Three single-conductor cables displayed in a trefoil in contact with each other. (4) The values of current-carrying capacity informed, correspond to three-conductor, four-conductor.