Hi Chris:
There are two kinds of circuits that may be connected
to the equipment protective earth terminal:
1) Protective earthing circuits.
2) Functional earthing circuits.
Protective earthing wiring must be colored green/yellow.
Functional earthing wiring can be colored any other
color. In some electronic products, functional earthing
wiring is colored black (by convention).
Protective earthing wire size must be at least equal to
the power cord wire size (because it must carry the
fault current provided by the power cord). In some
cases, on the load side of an internal fuse, the wire
size may be smaller.
Functional earthing wire size may be any size.
Both sets of circuits can be connected to the same
terminal. However, if this is the case, then the
protective earthing wiring must not be disturbed
while servicing the funtional earthing wiring. Usually,
this means double-nutting of the protective earthing
connections, and then placing the functional earthing
on top of the double-nuts, with its own nut.
Best regards,
Rich
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