In a message dated 96-09-25, Ron Pickard writes: >I have been asked to post a request to identify a telecommunications relay >which has a published Dielectric Strength (Hi Pot) of 1500 vac, ( or 2121 >vdc) between open contacts which is sometimes called "Contact-to-Contact >Dielectric Rating". > >This relay has been reportedly difficult to find, and if found could remove >costly additions for isolation of a serial port, to meet EN 41003/EN60950. >
Ron: Are you SURE that a 1500 volt dielectric strength test will be sufficient for EN 41003 and EN 60950? If you are trying to meet the requirements of supplementary insulation (clause 4.4.2 in EN 41003, and 6.3.3 in EN 60950), I think that creepage and clearance distance requirements will also apply. If you have information to the contrary, I would like to hear about it. A few years ago, the only relay I could find that met the requirements for supplementary insulation between open contacts was the Omron G5H-2. This part actually has reinforced insulation between open contacts! Nice part, but very expensive. I would be interested to hear about any other relays that might be suitable. Joe Randolph Telecom Design Consultant Randolph telecom, Inc.
