I am in East Timor helping out at a school. We have 3 phase and single phase. We have 5 welders that can be wired to single or 2 phase. Inside the welder is 3 posistions for links. Currently they are set 2 two phase so the 2 outsides sets of post have links. To set to higher voltage I have to wire just the middle posts. There are no instructions,..... Would I double up the links - they apear to be fusible links. or just wire with 1 link. Also the color coding is for single phase. I am assuming I wire l1 and l2 to active and neutral and wire the earth to earth Sound correct?