Is the alternative of doing the long run in 110v AC and providing local AC-DC converters at each location too expensive. Designing high current 48v distribution for radio telescopes might account for some of my grey hairs :-) Virus-free. www.avast.com <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb *Sent from my etch-a-sketch* On 13 October 2017 at 08:49, Jim Ruxton wrote: > > > Volt drop over length. To test this I was going to double the length, > then > > using my trusty Bench PSU limit current to Max expected then place a > short > > at far end and measure the volt drop. Sound feasible.? > Or maybe easier to measure the resistance of the wire and just multiply > by that max current expected to give you the voltage drop. Also there > are specs and tables that will give you the resistance of various gauge > wires. You can add a safety factor to that to be sure you are covered. > Jim > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .