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Hi Doc H Thanks for the reply The system i'm testing is a 690v beetween lives and 400v to earth on a water treatment plant.All the testing they require is megger testing 1000v and resistance R1+R2,Just need to check if the fuses and mcb's are correct. Matt

Hi I'm after some advice on the max zs for 3 phase 400 v circuits. Do I use the tables 41.2 - 41.4 in the regs as these are for 230 v or do I calculate them for 400 v . Also I know the calc for type 1,2,3 and b,c,d breakers but what about bs 88 as the tables only go up to 200 amps and are...