In message , Wanderer
writes
The *reason* for the second outage might have been human error [1], but
the second outage was most definitely *caused* (ie triggered) by the
first. It wasn't an "unrelated" incident.

I'll concede that point, but the discussions that were going on at the
time were much more of the nature that one 'bang' caused another 'bang'
because the circuits were overloaded. It seems *that* wasn't the case.

No, the debate was about whether the second 'bang' was related to the
first in *any* way shape or form. Lots of people insisted it wasn't.

One possible failure mode would be that the first 'bang' caused the
second circuit to overload, and cut out.

If the actual failure mode is the first 'bang' causing the second
circuit to *think* it's overloaded, and cut out, then the difference is
entirely academic to those people sat in the ensuing darkness.
--
Roland Perry