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Armoured Cable Volt Drop Calculator

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This cable calculator is to be used as a guide only; the armoured cable sizes are worked out using information given from your input, accurate values are essential to give you the correct cable size. The user is to ensure the type of cable is suited to environment and conditions the cable will be exposed to.

This cable calculator is set for Installation method C (Clipped Direct), for cable types BS5467 and BS6724 SWA (Steel wire armoured cable) and is based on the voltage drop selected at 230V single phase and 400V three phase.

Maximum permissible Voltage drop can be found in BS7671 – Table 4Ab

  • 3% for lighting (6.9V)
  • 5% for other uses (11.5V)

If you need any further help with sizing your cable please call one of our team on 01244 288138.

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It is important work out the Armoured cable sizes using the free volt drop calculator, we also recommend to think about the feature when sizing your cables. For example if your taking a cable to a garage you may want to give the cable some extra capacity for an electric car charger or heating in the future. This could save lots of time and money in the long run.