Maximum cable length.........??

[mickytuff]

Good afternoon all, firstly im pretty rubbish at cable calcs. My question is this, the load on the circuit is 6.6kw for a outdoor ev charger so the cable would be clipped direct. Using 4mm NYY cable is ok subject to the cable length, any ideas on the maximum cable length before having to use 6mm. All suggestions/advice greatly received :drunk:

 

[mickytuff]

I make it 27 meters max using 4mm, then upgrade to 6mm.