Volt drop calculator

[has]

Hi
does anyone know of a good link to a volt drop calculator for 3 phase cables above 25mm. I know tlc have one but its only for smaller sizes.

 

[ricicle]

Sorry obvious question but have you looked in the regs as the tables are there (don't know what part off hand as my regs book is at work) There are 3 columns for cables over 25mm due to the fact that these cable have a reactive volts drop as well as a resistive one

Ricicle

 

[has]

Thanks for the info but thats the problem, can do calculations for under 25mm but cant remember how to apply values "r" "x" and "z". Its for a 3phase install but the supply run is 311 meters for a 100 amp supply.

 

[Spark123]

There is a bit of an explanation and some formulae in the iee regs in appendix 4, part 7.