VOLTAGE DROP

Unless an electrical installation is specifically designed to operate under reduced voltage conditions, the voltage drop between the point of supply and any point of the electrical installation shall not exceed 5% of the normal voltage at the point of supply.

IE: 11.5V for 230V or 20V for 400V

FORMULA 1 Actual Volts FORMULA 2 *
where Vd =
L =
I =
mV/Am =
volt drop in volts
route length of cable in metres
current to be carried in Amps
millivolt per ampere metre
where Vc =
Vd =
L =
I =
millivolts per ampere metre
volt drop in volts
route length of cable in metres
current to be carried in Amps

*With this method the millivolts per ampere metre is given and the appropriate conductor size shall be selected from the relevant page of each cable type.

NOTE: AS/NZS 3008.1 series provide information on the calculation of voltage drop and a method of choosing conductor sizes taking into account voltage drop.

Firstflex has taken every precaution to ensure accurate information in this catalogue but accept no liability for any errors or omissions. Firstflex reserves the right to modify specifications at any time.