[Elecraft] Was Grounding negative side of power supply?-CORRECTING A SERIOUS ERROR

[Paul Christensen]

> That's tradition, and common practice, but there is nothing in
> NEC to discourage additional earth connections to the  ground
> (the green wire).

Supplemental electrode grounding is allowed under NEC Article 250.54.  One 
exception to multiple ground points on a circuit is the use of an isolated 
ground (IG) where a receptacle's dedicated ground lead is brought back 
directly to an upstream ground point (typically the serving main or sub 
panel) and does not come in electrical contact with conduit or other premise 
ground wiring between the receptacle and the isolated ground point.

Unlike standard receptacles, IG outlets break the continuity between the 
receptacle's ground screw and the metallic mounting yoke.  But, IG circuits 
are often more trouble than they're worth since the isolated ground used to 
protect sensitive equipment is often undermined by alternate grounding paths 
from other grounded sources through inter-connected cabling.

Paul, W9AC