At 4:45 pm a ground fault arrestor in the surface substation blew causing a power outage to the west side of the mine. At this time both #1 and #3 hoists were still operational. 4:52 pm the call was made to send crews home rather than have them sit idle. 4:53 pm MSHA notified of power outage. 6:30 pm all crews out of mine. 6:50 pm power restored to mine.