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Specifications and Current Capacity for SWA Cable 4 Core

The Table below displays the Technical Specifications and Current Carrying Capacity for SWA Cable 4 Core :-

Four Core Specifications

Nominal Cross Sectional Area (mm2)

1.5

2.5

4

6

10

16

25

35

50

70

95

120

150

185

240

300

400

Approx. Overall Diameter (mm)

12.0

13.7

15.0

17.3

19.8

22.3

27.6

30.6

32.7

38.0

41.3

46.4

50.5

55.3

61.1

66.7

75.3

Approx. Diameter Under Armour (mm)

8.1

9.6

10.9

12.3

14.6

17.1

21.6

24.1

26.4

30.6

34.1

37.6

41.6

46.0

51.6

56.8

63.6

Nominal Diameter of Armour Wires (mm)

0.9

0.9

0.9

1.25

1.25

1.25

1.6

1.6

1.6

2.0

2.0

2.5

2.5

2.5

2.5

2.5

3.15

Approx. Cable Weight (kg/km)

310

400

510

730

930

1260

1880

2330

2890

4120

5280

6790

8060

9770

12270

14900

19270

Maximum Conductor Resistance @ 20 Degrees C

12.1

7.41

4.61

3.08

1.83

1.15

0.727

0.524

0.387

0.268

0.193

0.153

0.124

0.0991

0.0754

0.0601

0.047

Conductor Short Circuit Rating (1 Sec/kA)

0.20

0.35

0.57

0.86

1.4

2.2

3.6

5.0

7.1

10.0

13.6

17.2

21.4

26.5

34.3

42.9

57.2

Three Phase AC Clipped Direct (Amps)

23

31

42

53

73

94

124

154

187

238

289

335

386

441

520

599

673

Three Phase AC Free Air (Amps)

25

33

44

56

78

99

131

162

197

251

304

353

406

463

546

628

728

Volt Drop Three Phase AC (mV/A/m)

27

16

10

6.8

4

2.5

1.65

1.15

0.87

0.60

0.45

0.37

0.30

0.26

0.21

0.185

0.165

The Maths behind 4 Core Armoured Cable volt drop

The following formula is used to calculate Voltage Drop in 4 core SWA  cable = (mV/A/m) x Ib x L / 1000.

  • (mV/A/m): To find the value for (mV/A/m) we need to look in the current carry capacity and voltage drop tables on the pages below.
  • Ib: This is in AMPs, design current which is watts divided by voltage.
  • L:  length of the circuit in metres.

We divide it by 1000 to convert the figure from Millivolts into Volts

You should have no less than 3% volt drop for a lighting circuit and no more that 5% for any other circuit, if you do you need to up the size cable and re-calculate until you are within the permissible volt drop %.

Click this link purchase 4 Core SWA Cable

We have listed on the site up to 95mm 4 core armoured cable, if you need any bigger than this please feel free to call our Sales Team on 01244 288138 for further assistance and information.

SWACable.net is located on Zone 1 of Deeside Industrial Estate near Chester, so if you’d prefer to pick up your SWA Cable 4 Core as opposed to having it delivered, please feel free to do so.
SWA Cable 4 Core for the best prices online with fast, free delivery on orders over £100.