BS 6883 657TQ Type SW4 Cable

Dimensions

No. of Cores	Conductor Class	Nominal Cross Sectional Area mm²	Nominal Thickness of Insulation mm	Nominal Thickness of Outer Sheath mm	Nominal Overall Diameter mm	Nominal Weight kg/km
1	5	1	0.8	1	4.8	34
1	5	1.5	0.8	1	5.1	40
1	2	2.5	0.8	1	5.6	54
1	2	4	1	1	6.5	78
1	2	6	1	1	7.1	101
1	2	10	1	1	8.1	144
1	2	16	1	1.1	9.5	216
1	2	25	1.2	1.2	11.4	328
1	2	35	1.2	1.2	12.6	429
1	2	50	1.4	1.3	14.3	551
1	2	70	1.4	1.3	16	753
1	2	95	1.6	1.4	18.6	1049
1	2	120	1.6	1.5	20.3	1274
1	2	150	1.8	1.6	22.4	1568
1	2	185	2	1.7	24.9	1949
1	2	240	2.2	1.8	28	2530
1	2	300	2.4	1.9	30.9	3134
1	2	400	2.6	2	35.3	4258
1	2	500	2.8	2.2	39.3	5337
2	5	1	0.8	1	8.1	86
2	5	1.5	0.8	1.1	8.5	103
2	2	2.5	0.8	1.1	9.5	140
2	2	4	1	1.2	11.6	210
2	2	6	1	1.2	12.7	270
2	2	10	1	1.3	14.9	391
2	2	16	1	1.4	17.5	574
2	2	25	1.2	1.5	21.2	864
2	2	35	1.2	1.6	23.7	1129
2	2	50	1.4	1.7	26.9	1452
2	2	70	1.4	1.9	30.8	1991
2	2	95	1.6	2.1	35.9	2766
2	2	120	1.6	2.2	39.1	3338
2	2	150	1.8	2.3	43.2	4097
3	5	1	0.8	1.1	8.4	100
3	5	1.5	0.8	1.1	9	122
3	2	2.5	0.8	1.1	10.1	169
3	2	4	1	1.2	12.3	257
3	2	6	1	1.2	13.5	335
3	2	10	1	1.3	15.9	490
3	2	16	1	1.4	18.6	732
3	2	25	1.2	1.6	22.7	1121
3	2	35	1.2	1.7	25.4	1474
3	2	50	1.4	1.8	28.9	1893
3	2	70	1.4	2	33	2611
3	2	95	.6	2.2	38.5	3638
3	2	120	1.6	2.3	41.9	4400
3	2	150	1.8	2.5	46.5	5425
3	2	185	2	2.7	51.8	6754
3	2	240	2.2	2.9	58.6	8770
4	5	1	0.8	1.1	9.1	122
4	5	1.5	0.8	1.1	9.8	149
4	2	2.5	0.8	1.1	11	210
4	2	4	1	1.2	13.4	321
4	2	6	1	1.3	15	428
4	2	10	1	1.4	17.6	627
4	2	16	1	1.5	20.7	940
4	2	25	1.2	1.7	25.3	1442
4	2	35	1.2	1.8	28.3	1899
4	2	50	1.4	1.9	32.1	2439
4	2	70	1.4	2.1	36.7	3370
4	2	95	1.6	2.3	42.8	4700
4	2	120	1.6	2.5	46.8	5710
4	2	150	1.8	2.7	51.9	7035
5	5	1.5	0.8	1.1	10.7	180
5	2	2.5	0.8	1.2	12.2	260
5	2	4	1	1.3	15.2	394
5	2	6	1	1.4	16.9	463
5	2	10	1	1.5	19.6	685
7	5	1.5	0.8	1.2	12.8	252
7	2	2.5	0.8	1.2	14.4	359
12	5	1.5	0.8	1.3	15.6	370
12	2	2.5	0.8	1.4	17.9	543
19	5	1.5	0.8	1.4	19.4	570
19	2	2.5	0.8	1.5	22.2	842
27	5	1.5	0.8	1.6	22.4	766
37	5	1.5	0.8	1.7	26.2	1037

Class 5 Flexible Copper Conductors

Nominal Cross Sectional Area mm²	Maximum Diameter of Wires in Conductor mm	Maximum Resistance of Conductor at 20°C
		Plain Wires ohms/km	Metal-Coated Wires ohms/km
1	0.21	19.5	20
1.5	0.26	13.3	13.7

Class 2 Stranded Copper Conductors

Nominal Cross Sectional Area mm²	Minimum No. Of Wires In Conductor						Maximum Resistance of Conductor At 20ºC
	Circular		Circular Compacted		Shaped		Annealed Copper Conductor
	Cu	Al	Cu	Al	Cu	Al	Metal-Coated Wires ohms/km
2.5	7	-	6	-	-	-	7.56
4	7	-	6	-	-	-	4.7
6	7	-	6	-	-	-	3.11
10	7	7	6	6	-	-	1.84
16	7	7	6	6	-	-	1.16
25	7	7	6	6	6	6	0.734
35	7	7	6	6	6	6	0.529
50	19	19	6	6	6	6	0.391
70	19	19	12	12	12	12	0.27
95	19	19	15	15	15	15	0.195
120	37	37	18	15	18	15	0.154
150	37	37	18	15	18	15	0.126
185	37	37	30	30	30	30	0.1
240	37	37	34	30	34	30	0.0762
300	61	61	34	30	34	30	0.0607
400	61	61	53	53	53	53	0.0475
500	61	61	53	53	53	53	0.0369

Current Carrying Capacity

Nominal Cross Sectional Area mm²	Single Core Amps	2 Core Amps	3 and 4 Core Amps	5 Core Amps	7 Core Amps	12 Core Amps	19 Core Amps	27 Core Amps	37 Core Amps
1	18	15	13	10.5	-	-	-	-	-
1.5	23	20	16	12	10	9	7	6.5	6
2.5	30	26	21	16	15	12	10	9	8
4	40	34	28	-	-	-	-	-	-
6	52	44	36	-	-	-	-	-	-
10	72	61	50	-	-	-	-	-	-
16	96	82	67	-	-	-	-	-	-
25	127	108	89	-	-	-	-	-	-
35	157	133	110	-	-	-	-	-	-
50	196	167	137	-	-	-	-	-	-
70	242	206	169	-	-	-	-	-	-
95	293	249	205	-	-	-	-	-	-
120	339	288	237	-	-	-	-	-	-
150	389	331	272	-	-	-	-	-	-
185	444	377	311	-	-	-	-	-	-
240	522	444	365	-	-	-	-	-	-
300	601	511	421	-	-	-	-	-	-
400	719	611	503	-	-	-	-	-	-
500	827	703	579	-	-	-	-	-	-

Ambient Air Temperature of 45°C

De-Rating Factors

Ambient Temperature °C	35	40	45	50	55	60	65	70	75	80
DE-RATING FACTOR	1.1	1.05	1	0.94	0.88	0.82	0.74	0.67	0.58	0.47

When more than six bunched cables on cable trays, in cable conduits, pipes or trunking are expected to operate  simultaneously full rated capacity, a correction factors of 0.85 should be applied.