# SWA Current Carrying Capacity

The current carrying capacity of an SWA cable will depend on the installation method adopted and the application of any relevant correction factors such as grouping or soil resistivity as a couple of examples.

## SWA Calculator

Calculate the required size of an SWA cable which includes current carrying capacity, voltage drop and correction factors.

## SWA Current Carrying Capacity Tables

SWA current carrying capacity tables are listed in BS 7671, also rating factor tables for various installation methods are listed in Appendix 4 Current Carrying Capacity and Voltage Drop for Cables.

SWA current carrying capacity tables include:

• Single-core armoured 70°C thermoplastic insulated cables (non-magnetic armour)
• Multi-core armoured 70°C thermoplastic insulated cables
• Single-core armoured 90°C thermosetting insulated cables (non-magnetic armour)
• Multi-core armoured 90°C thermosetting insulated cables
16mm SWA Current Carrying Capacity Table
Multi-core armoured 90°C thermosetting insulated cables (copper) - 1 three or 1 four core cable three phase.
CSA Clipped Direct
1.5 mm 23 Amps
2.5 mm 31 Amps
4 mm 42 Amps
6 mm 53 Amps
10 mm 73 Amps
16 mm 94 Amps
25 mm 124 Amps
35 mm 154 Amps
50 mm 187 Amps
70 mm 238 Amps
95 mm 289 Amps
120 mm 335 Amps
150 mm 386 Amps
185 mm 441 Amps
240 mm 520 Amps
300 mm 599 Amps
400 mm 787 Amps

## SWA Cable Size Calculator

When selecting an SWA cable size, in addition to checking the current carrying capacity of the SWA cable it is also important to check the voltage drop, maximum permissible Zs value of your protective device and apply any relevant correction factors.

Failure to carry out a full and proper SWA cable size calculation may result in an undersized SWA cable being selected.

## SWA Cable Size Current Carrying Capacity

The maximum current carrying capacity of an SWA cable varies between SWA cable sizes and number of cores.

SWA cables are available in a multitude of sizes and cores varying from 1.5mm upto 400mm and above.

## SWA Calculator

Calculate the required size of an SWA cable which includes current carrying capacity, voltage drop and correction factors.