Larry, Duane is close, it probably comes from the requirements of Telecom (Australia) Specification 1053. The requirements were 3500VAC add a bit for component requirements = 3750, which was the normal practice at the time.
Brings back some bad memories. On Wed, 30 Jul 1997, Duane J. Marcroft wrote: > Larry, > > If memory serves me well, the 3750V comes from an Austel spec. I believe > this was due to higher mains voltage (240V) in Australia. > > Duane > > > >Hello Treggers, > > > >I'm looking for a standard that prescribes 3750VAC seperation from circuitry > >to be connected to telecom networks. I know BABT rated line transformers are > >tested at this magnitude, as published in most telco transformer > >manufacturers spec sheets. The rating in EN41003/En 60950 (impluse test > >voltage) is 2.5kV dc to non-network ports/and handsets (through foil) . From > >my notes, I understand that BS6301 was replaced by EN41003 in 93, so the > >3750V rating may be from that standard. > > > >Who can help shed light on this? > > > >Thanks in advance. > > > > > >----------------------------------------------------- > >Larry Barnette > >Compliance Engineer > >Instrument Associates > >2455 Harbor Ave. > >Memphis, Tenn. USA 38113 [email protected] > >----------------------------------------------------- > > > > Chris Healy Liaison Manager, Standards and Approvals email : [email protected] JNA Telecommunications Limited Ph (direct) : +61 2 9935 5728 16 Smith St, Chatswood, NSW 2067 Fax : +61 2 9417 3862 AUSTRALIA
