Chris Lewis wrote:

According to Toller :

You are correct that it normally carries nothing, but why would a breaker
open on a ground fault? (unless it is a gfci...)

A ground fault is simply a leak to the grounding conductor - it could
be a few milliamps, or many amps.

A ground fault is a leak to ground. It may or may not pass through the
grounding conductor.

Breakers trip on big ones. GFCIs trip on small ones.

Breakers trip on excessive current regardless of the path that it takes.
GFCIs trip on an unbalance between the two wires that compose the active
circuit.

--
--John
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(was jclarke at eye bee em dot net)