In article , David H Wild
writes
The power failure lasted just over half an hour - and there was no chain
reaction in the way that happened in North America.

Surely the second failure, after 7 seconds, was a chain reaction. Even
if there wasn't a third link in that chain.
--
"It used to be that what a writer did was type a bit and then stare out of the
window a bit, type a bit, stare out of the window a bit. Networked computers
make these two activities converge, because now the thing you type on and the
window you stare out of are the same thing" - Douglas Adams 28/1/99.