[Elecraft] (OT) Grounding Mat

[Tom W8JI]

> NO! This is a summary of NEC (National Electric Code) 
> requirements: The
> NEUTRAL of a transformer on the secondary side MUST be 
> bonded to the
> equipment ground (steel conduit, the green wire, building 
> structure, etc),
> and that green wire must be carried from the breaker panel 
> to each outlet and
> to the transformer.  The neutral conductor that feeds the 
> primary side of the
> transformer must be bonded to ground at the service for 
> the building (that
> is, the main breaker panel). And, as we all know, all 
> groundes must be bonded
> together. Thus, an isolation transformer does NOT isolate 
> either the neutral
> or the equipment ground.

I wonder when that changed? All of my isolation 
transformers, probably manufactured in the 70's or 80's, 
float the mains terminals on the load side. We used them all 
the time working on AC/DC radios and I still use them now 
working on SMPS. Only the case and safety grounds are 
grounded.