related multiple-outage occurrence with a single external initiating event where the outages involved are not consequences of each other ![](/iev/iev.nsf/FiguresShared/692-fig5-en/$file/692-fig5-en.png)
Figure 5 – Outage occurrence relationships Note 1 to entry: A common-cause outage occurrence can be caused by a lightning strike and back-flashover to both circuits of a double-circuit line, resulting in the outage of both circuits.
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