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.