Current Carrying Capacity for SWA Cable 3 Core

Technical Specifications and Current Capacity – SWA Cable 3 Core

The Table below displays the Technical Specifications and Current Carrying Capacity of 3 Core Armoured Cable, this cable is mainly used for single phase 240v applications giving live neutral and earth cores –

How to size your 3 core SWA cable

Electrical engineers and electricians can use the below the formula to work the volt drop on 3 core armoured cable.

Voltage Drop = (mV/A/m) x Ib x L / 1000.

(mV/A/m): To find the value for (mV/A/m) use the above tables
Ib: Design current in Amps which is watts divided by voltage
L: length of the circuit in metres

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

Click this helpful link, We have a fantastic range of SWA Cable 3 Core to suit your installation.

If you cannot find the 3 core SWA 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.
Quickbit 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.
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