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Current Carrying Capacity Tables

The links below show tables of the current carrying capacity and voltage drops relating to Doncaster Cables products.

Below these links you will find our cable calculator. Instructions below:-

1. Choose your supply type (Single phase 230V / Three Phase 400V)
2. Choose your required voltage drop
3. Input the power in watts or current in amperes which you require your cable to carry
4. Input the length of your cable run
5. Choose the method of installation how the cable is going to be installed
6. Press calculate and your cable sizes will be calculated.

Our calculator now lists different cable types, so by scrolling down the list you are able to see how different cable types may have different sizes for the same set of parameters.
Choose a cable which is suitable for your installation.

Cable Size Calculator

Supply Type


Cable Run


Cable Size Calculator Disclaimer

The recommended cable sizes are based upon information provided by the user and are intended as a guide only. The calculation is derived from BS7671 Requirements for Electrical Installation, IEE Wiring Regulations, and is based on the voltage drop selected at 230 and 400 volts. In order for us to provide this information as a guide certain assumptions will have been made

It remains the responsibility of the user to ensure all data and assumptions are correct and that any cable used is suitable for its intended purpose.

The current carrying capacity tables for flexible cords in BS7671 do not include options for different installation methods, results have been included for flexible cords for the whole range of installation methods. It remains the responsibility of the user to ascertain where flexible cords are suitable.
We have combined flexible cords into one result for the use of our calculator (to make it more user friendly) please refer to BS7671 for individual tables and any relevant correction factors etc

Doncaster Cables accept no liability whatsoever for any use made of the proposed cable size

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