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Specifications and Current Capacity for SWA Cable 5 Core

The Table below displays the Technical Specifications and Current Carrying Capacity for SWA Cable 5 Core:-

Five Core Specifications

Nominal Cross Sectional  Area (mm2)

1.5

2.5

4

6

10

16

25

35

Approx. Overall Diameter (mm)

13.0

14.7

16.9

18.6

21.2

25.4

30.2

33.2

Approx. Diameter Under Armour (mm)

8.9

10.6

12.1

13.6

16.2

19.4

24.2

27.0

Nominal Diameter of Armour Wires (mm)

0.9

0.9

1.25

1.25

1.25

1.6

1.6

1.6

Approx. Cable Weight (Kg, km)

360

460

610

840

1090

1700

2300

2830

Maximum Conductor Resistance @ 20 Degrees C

12.1

7.41

4.61

3.08

1.83

1.15

0.727

0.524

Conductor Short circuit rating (1 Sec)
kA

0.20

0.35

0.57

0.86

1.4

2.2

3.6

5.0

Three Phase AC Clipped Direct (Amps)

23

31

42

53

73

94

124

154

Three Phase Free Air
(Amps)

25

33

44

56

78

99

131

162

Volt Drop Three Phase AC (mV/A/m) 27 16 10 6.8 40 2.5 1.65 1.15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The Maths behind SWA 5 core Cable volt drop

The following formula is used to calculate Voltage Drop in 5 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 %.

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If you cannot find the required SWA Cable 5 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, so if you’d prefer to pick up your SWA Cable 5 Core as opposed to having it delivered, please feel free to do so.
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