transfer switch grounding wire

Contemporary generator isolation transfer switches, including Gentrans, have a green grounding wire running through the armor circuit hook up harness that connects to the grounding block in utility service box. Why is there no such wire in my really old version of the Gentran 20216?
Anything to do with the emergence of plastic conduit?
Dennis
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On Tue, 4 Nov 2008 09:12:46 -0800 (PST), vanderyn58

Yes, that and the fact that a lot of AHJs will require a hard wire ground in spite of the metal conduit.
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