Wayne Whitney wrote:
Hello,

Is it standard for a residential electrical subpanel to use its
chassis as a ground backplane? I.e. the ground from the incoming
4-wire feed terminates at a lug bolted to the back of the panel, and
the ground bar is also just bolted to the back of the panel.

Thanks, Wayne


It would be better practice to have all Equipment Grounding Conductors
terminate to the Grounding buss bar so as to avoid using the cabinet as
a fault current pathway. If more than one Grounding buss bar is
installed they should be bonded to each other by running a conductor
that is sized for the largest Over Current Protective Device supplying
power to that panel between the buss bars.
--
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous
for general use." Thomas Alva Edison