voltage drop

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Got a call to move a service on a scrap metal shredding business. Looked at the job, come to find out they're experiencing a very sporatic voltage drop on one particular leg, 120 to 80.6 for approx. 6-10 seconds( at times). Its not consistent with spikes in current, though. Its not consistent with anything, A/C start windings, heat strips, nothing. Could it be loose connections somewhere? Analysis engineer from utility is monitoring right now. All is inconclusive. Doesn't matter if its an a/c day or a heat day. Is causing battery backup for computers to kick in but not before the servers are crashing. Never before!!!!
 
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