Tools

Cable size and voltage drop

For a three-phase 415 V feeder on RR Kabel 3 or 3.5 core armoured cable. It finds the smallest size that carries the load and keeps the voltage drop over the run within your limit.

Load given as

Current, A if given as current

Power, kW if given as power

Power factor

Conductor

Insulation

Laid

Run length, m

Voltage drop allowed, %

Use the figure in your specification; many projects work to 3 to 5% at the load.