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Specifications and Current Capacity for SWA Cable 3 Core

The Table below displays the Technical Specifications and Current Carrying Capacity for SWA Cable 3 Core:-

Three 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) 11.3 12.8 14.0 15.2 18.1 20.6 26.0 27.6 30.0 33.6 38.1 41.3 45.7 49.7 54.8 59.8 65.5
Approx. Diameter Under Armour (mm) 7.4 8.7 9.9 11.1 13.1 15.4 19.6 21.9 24.3 27.4 30.7 33.8 36.3 40.8 45.5 49.9 55.5
Nominal Diameter of Armour Wires (mm) 0.9 0.9 0.9 0.9 1.25 1.25 1.6 1.6 1.6 1.6 2 2 2.5 2.5 2.5 2.5 2.5
Approx. Cable Weight (kg/km) 280 350 430 540 830 1110 1590 1930 2360 3070 4250 5090 6430 7800 9680 11670 14390
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 0.6 0.45 0.37 0.3 0.26 0.21 0.185 0.165

 

The Maths behind 3 Core SWA cable volt drop

The following formula is used to calculate Voltage Drop in 3 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 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 %.

Follow this link view our great range of 3 core swa cable including single phase colours.

If you cannot find the3 core armoured cable you require in the range we have on the site, please feel free to give our sales team on 01244 288138 for further information and assistance.
SWACable.net is located on Zone 1 of Deeside Industrial Estate near Chester, so if you’d prefer to arrange a pickup as opposed to getting your SWA Cable 3 Core delivered, please feel free to do so as all pickups are welcome.