Negative rail grounding
Posted by
Michael Blake on
Apr 18, 2018; 6:10pm
URL: http://elecraft.85.s1.nabble.com/Negative-rail-grounding-tp7640271.html
I though I would separate this from the other discussion. It seems that my newest Astron SS30 power supply does not allow for the negative post to be isolated from the chassis. The green wire can be disconnected from the chassis but the negative rail of the DC output can not be isolated from the chassis. The negative rail is firmly connected to the chassis via two of the circuit board mounting screws. Separation would only be possible by using insulating washers and nylon screws.
This is not true in one of my older supplies. Has there been an NEC or UL change that requires that one side of the output of a DC supply be grounded?
Michael Blake
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