Powering an Arduino Uno board with a -48v DC power plant

Using Arduino Motors, Mechanics, Power and CNC
3

I think that these are isolated.
AT&T FE075C, 75W
http://www.bgmicro.com/48v18ain15v5aout.aspx
AT&T FW100C9, 100W
http://www.bgmicro.com/48v-2-5a-in-15v-6-7a-out.aspx

Same price ($10).
Comb the Internet for data.