Single Core Cables Copper Conductors

Current ratings for three phase and single phase circuits and volt drop at rated current. Single core Thermosetting insulated unarmoured copper cables with or without sheath to BS7211 or BS5467.

Full thermal ratings: Ambient temperature 30°C Conductor operating temperature 90°C

Conductor Cross-Sectional Area	Reference Method 4 (enclosed in conduit in thermally insulating wall etc)		Reference Method 3 (Enclosed in conduit on a wall or in trunking etc)		Reference Method 1 (clipped Direct)		Reference Method 11 (on a perforated cable tray horizontal or vertical)		Reference Method 12 (free air)
					Reference Method 1 (clipped Direct)				Horizontal Flat Spaced	Vertical Flat Spaced	Trefoil
	2 Cables, single-phase AC or DC	3 or 4 Cables, three-phase AC	2 Cables, single-phase AC or DC	3 or 4 Cables Three-Phase AC	2 Cable single-phase Ac or DC Flat and Touching	3 or 4 Cables three-phase AC flat and touching or trefoil	2 Cables, single-phase AC or DC Flat and Touching	3 or 4 Cables three-phase AC Flat and touching or Trefoil	2 Cables, single-phase AC or DC or 3 cables three-phase AC	2 Cables, single-phase AC or DC or 3 cables three-phase AC	3 Cables trefoil three-phase
mm²	A	A	A	A	A	A	A	A	A	A	A
1	14	13	17	15	19	17.5	-	-	-	-	-
1.5	18	17	22	19	25	23	-	-	-	-	-
2.5	24	23	30	26	34	31	-	-	-	-	-
4	33	30	40	35	46	41	-	-	-	-	-
6	43	39	51	45	59	54	-	-	-	-	-
10	58	53	71	63	81	74	-	-	-	-	-
16	76	70	95	85	109	99	-	-	-	-	-
25	100	91	126	111	143	130	158	140	183	163	138
35	124	111	156	138	176	161	195	176	226	203	171
50	149	135	189	168	228	209	239	215	274	246	209
70	189	170	240	214	293	268	308	279	351	318	270
95	228	205	290	259	355	326	375	341	426	389	330
120	263	235	336	299	413	379	436	398	495	453	385
150	300	270	375	328	476	436	505	461	570	524	445
185	341	306	426	370	545	500	579	530	651	600	511
240	400	358	500	433	644	590	686	630	769	711	606

VOLTAGE DROP (per ampre per metre):
Conductor operating temperature: 90°C

Conductor Cross-Sectional Area	2 Cables DC	2 Cables, single-phase AC									3 or 4 Cables, Three-Phase AC
Conductor Cross-Sectional Area	2 Cables DC	Reference methods 3 & 4 (Enclosed in conduit etc. in or on a wall)			Reference methods 1 & 11 (Clipped direct or on trays, touching)			Reference method 12 (spaced*)			Reference methods 3 & 4 (Enclosed in conduit etc. in or on a wall)			Reference Methods 1, 11 & 12 (in trefoil)			Reference methods 1 & 11 (flat and touching)			Reference method 12 (Flat spaced*)
mm²	mV/A/m	mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m
1	46	46			46			46			40			40			40			40
1.5	31	31			31			31			27			27			27			27
2.5	19	19			19			19			16			16			16			16
4	12	12			12			12			10			10			10			10
6	7.9	7.9			7.9			7.9			6.8			6.8			6.8			6.8
10	4.7	4.7			4.7			4.7			4.0			4.0			4.0			4.0
16	2.9	2.9			2.9			2.9			2.5			2.5			2.5			2.5
		r	x	z	r	x	z	r	x	z	r	x	z	r	x	z	r	x	z	r	x	z
25	1.85	1.85	0.31	1.90	1.85	0.190	1.85	1.85	0.28	1.85	1.60	0.27	1.65	1.60	0.165	1.60	1.60	0.190	1.60	1.60	0.27	1.65
35	1.35	1.35	0.29	1.35	1.35	0.180	1.35	1.35	0.27	1.35	1.15	0.25	1.15	1.15	0.155	1.15	1.15	0.180	0.15	1.15	0.26	1.20
50	0.99	1.00	0.29	1.05	0.99	0.180	1.00	0.99	0.27	1.00	0.87	0.25	0.90	0.86	0.155	0.87	0.86	0.180	0.87	0.86	0.26	0.89
70	0.68	0.70	0.28	0.75	0.68	0.175	0.71	0.68	0.26	0.73	0.60	0.24	0.65	0.59	0.150	0.61	0.59	0.175	0.62	0.59	0.25	0.65
95	0.49	0.51	0.27	0.58	0.49	0.170	0.52	0.49	0.26	0.56	0.44	0.23	0.50	0.43	0.145	0.45	0.43	0.170	0.46	0.43	0.25	0.49
120	0.39	0.41	0.26	0.48	0.39	0.165	0.43	0.39	0.25	0.47	0.35	0.23	0.42	0.34	0.140	0.37	0.34	0.165	0.38	0.34	0.24	0.42
150	0.32	0.33	0.26	0.43	0.32	0.165	0.36	0.32	0.25	0.41	0.29	0.23	0.37	0.28	0.140	0.31	0.28	0.165	0.32	0.28	0.24	0.37
185	0.25	0.27	0.26	0.37	0.26	0.165	0.30	0.25	0.25	0.36	0.23	0.23	0.32	0.22	0.140	0.26	0.22	0.165	0.28	0.22	0.24	0.33
240	0.190	0.21	0.26	0.33	0.20	0.160	0.25	0.195	0.25	0.31	0.185	0.22	0.29	0.170	0.140	0.22	0.170	0.165	0.24	0.170	0.24	0.29