One day after the power outage that initially affected just under 10,000 West Seattle homes and business, we asked Seattle City Light for more details on what went wrong and why a problem on one pole affected so many. The reply from SCL spokesperson Julie Moore:
Similar to the comment Maria left on the blog this morning, the cause was due to a “sleeve” failure. The sleeve holds together the two ends of spliced cable. In this case, the cable that failed was connected to one feeder, which served about half of the total customers impacted. The other half were impacted because that cable fell onto wires associated with a different feeder. Once making the scene safe, we were able to reduce the impact to 14 customers on one feeder and 455 on the other through switching. The rest of the customers were restored after we made necessary repairs.
As noted in our coverage last night, that last group of customers was out for about seven hours, while the rest got theirs back within about an hour and a half.