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
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.
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