Confused and missing something pretty basic here, I think.
As I look at the diagrams in annex NAB for UL 1950 or UL60950 I am
pretty confused.
What it appears to show me is a floating system -48 and -48
reference lines into the power supply system. Do I really have to float my
circuit boards etc, (ungrounded SELV?), and use the -48 reference line as
the return path rather than chassis and its bonding wire (grounded SELV).
Logic and chassis are not tied togeather until after a considerable distance
down the line?
Am I stairing into the obvious and missing the point?
Heavy sigh
Gary
-------------------------------------------
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
To cancel your subscription, send mail to:
[email protected]
with the single line:
unsubscribe emc-pstc
For help, send mail to the list administrators:
Jim Bacher: [email protected]
Michael Garretson: [email protected]
For policy questions, send mail to:
Richard Nute: [email protected]
