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
[email protected]

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