On 7/3/96, Jonathon Malton writes:
>I wonder if I need to provide user-accessible fuses on the unit at the
>IEC power entry module. I would rather use a module incorporating
>only IEC connector and DPST switch (voltage selection isn't needed
>with this supply), and I understand that the EC is moving away from
>traditional fusing anyway.
>....I suspect that it would be unnecessary......
I agree.. I don't see why a user accessible fuse is necessary The
difficult choice would be to find a fuse rated low enough to fail gracefully
during the product safety abnormal tests and yet withstand nuisance tripping,
ie,inrush current, voltage fluctuations.
The abnormals mentioned above include shorting critical components such as
transformer secondaries, bridge rectifiers, oscillator drivers, etc., one at a
time to develop maximum heating. Temperature rises are measured to see if
insulation breakdown is probable.
My opinions only, and not necessarily those of my employer.
Eric Petitpierre
Pulsecom
Herndon, VA
[email protected]
