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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