North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Summary: Bay Area Power (2000-06-14)
When you lose a part of a multi-phase circuit, you usually get bleed through enduser devices that are still getting power through the other phases. Your 27VAC was probably bleen through a (or more likely several) three-phase motors that did not have phase-outage protection circuit breakers. They probably had stopped spinning and were slowly cooking themselves. A building I once worked at lost one of their phases and after an hour the fire alarm went off and we had to evacuate the whole 10 stories. A "temporary" compressor in a design model shop did'nt have adequate protection and cooked all it's lubrication, filling the shop with smoke. Apparently, phase-outage protection is not required in many installations where it should be. One data-center in the same building still had some three phase powered mini-computers (mini in name only) and they lost almost half their hardware. JMH Jim Browne wrote: > Downtown Sunnyvale around Carroll Street (including PacBell SNVCA01 > and us) lost power (on one phase only) yesterday at 12:35 PDT. PG&E > brought it back at 15:35. PG&E said that our area is using too much > power and we blew the breaker on that phase. The odd thing was we > were still getting about 27 VAC on that phase with the breaker > "blown". -- John Hall <[email protected]> F5 Networks, Inc. Senior Test Engineer 206-505-0800 One of the large consolations for experiencing anything unpleasant is the knowledge that one can communicate it. -- Joyce Carol Oates
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