Building with a single phase service has an elevator delivered which requires 3 phase power (we've all been in a similar situation with some piece of equipment, right? ). We warned the architect about this ahead of time. They stated at that time it was going to be one of those small residential lifts which will only require a single phase circuit which is what was provided on the drawing but it seems they decided to change their mind for whatever reason 6 months down the road and switch to a commercial style elevator. So .... It was asked if they can feed the elevator from an adjacent building they own which does have a three phase service. I tooled around the NEC looking for the exact you can't do that per NEC Article ? section ? because...... which I know exists but I thought I would get a quicker response using the expertise of this forum. Thanks for responding!