Originally Posted By: Steven Brewster
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I inspected a Mfg home and have the following questions regarding the electrical service. A disconnect is located at the exterior (which is grounded at this enclosure). A three wire feeder cable runs in conduit to the panel in the home (which is also grounded at a separate location). The panel in the home has both the grounded conductors and grounding electrodes on the same bus and the panel is bonded to the bus. Should this service have been a 4-wire from the disconnect? Should the distribution panel in the home have isolated grounds and neutrals and no separate ground? See pics.
[ Image: Disconnect ]
[ Image: Distribution Panel (or main panel) ]
I was told recently by a licensed electrician that older (three wire service neutral and grounds on same bus) distribution panels are "grandfathered" into the code and are not required to have isolated grounding electrodes and grounded conductors. New construction, of course would require.