Thank you to all who responded. I'm still a little unclear as to where the 500 Vac voltage comes from. Is it called out in UL1950 or is it an NRTL determined value?
Is the -48 Vdc considered SELV or a hazardous voltage secondary? Thanks again, Jerry On Sat, 3 Jul 1999 14:49:52 -0700 Jerry Martin <martin_je...@juno.com> writes: >Does UL 1950 require that a production line hipot test be performed on >equipment powered by Central Office -48 Vdc? If so, what is the >voltage/duration? > >I can understand a production line test on 120/220 Vac powered >equipment because you're trying to catch insulation breakdown between >line and ground. What hazard would you be preventing if your >equipment is powered by -48 Vdc in a Central Office? Isn't this >SELV? > >Thank you in advance for any replies. > >Jerry ___________________________________________________________________ Get the Internet just the way you want it. Free software, free e-mail, and free Internet access for a month! Try Juno Web: http://dl.www.juno.com/dynoget/tagj.
