I was browsing through some posts last night (quiz night was cancelled due to some bloody fottie match) and I read that ZE at a sub is irrellevant and the parent boards ZE is used and does that mean the feed to sub is treated as a circuit and ZS recorded and all the subs circuits likewise? I always looked at it thus the supply to the sub should be at or damn close to the ZE at the main board allowing for volt drop if not youve done some thing wrong I know that there is exceptions static vans come to mind but as I have found out that is generally down to assuming that 2.5 swa will suit all needs
DM
DM