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Specifications and Current Capacity for SWA Cable 2 Core

The Table below displays the Technical Specifications and Current Carrying Capacity for SWA Cable 2 Core:-

Two 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)

10.8

12.3

13.4

14.5

16.7

19.5

20.8

23.4

25.5

29.0

31.9

34.4

37.9

42.4

46.4

50.3

54.7

Approx. Diameter Under Armour (mm)

6.9

8.2

9.3

10.4

12.4

14.5

15.6

17.4

19.7

22.7

25.1

27

30.2

33.5

37.2

40.9

45.1

Nominal Diameter of Armour Wires (mm)

0.9

0.9

0.9

0.9

0.9

1.25

1.25

1.6

1.6

1.6

2.0

2.0

2.0

2.5

2.5

2.5

2.5

Approx. Cable Weight (Kg, km)

250

320

380

460

570

840

1060

1410

1730

2260

3030

3610

4330

5600

6940

8100

9940

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

DC or Single Phase AC Clipped Direct

(Amps)

27

36

49

62

85

110

146

180

219

279

338

392

451

515

607

698

787

DC or Single Phase AC Free Air (Amps)

29

39

52

66

90

115

152

188

228

291

354

410

472

539

636

732

847

Volt Drop DC (mV/A/m)

31

19

12

7.9

4.7

2.9

1.85

1.35

0.98

0.67

0.49

0.39

0.31

0.25

0.195

0.155

0.12

Volt Drop Single Phase AC Touching (mV/A/m) 31 19 12 7.9 4.7 2.9 1.9 1.35 1.0 0.69 0.52 0.42 0.35 0.29 0.24 0.21 0.19

The Maths behind 2 Core SWA cable volt drop

The following formula is used to calculate Voltage Drop in 2 core armoured 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 all 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 %.

Please follow this link to our great selection of SWA Cable 2 Core

If you cannot find the required SWA Cable 2 Core, 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,  if you’d prefer to pick up your 2 Core SWA Cable as opposed to having it delivered, please feel free to do so.