[c-nsp] Multiple power supply failures. Advise needed

[Michael K. Smith]

You might also be experiencing a sag, not a spike, where your going below
the rated power input for the supply. These can be as damaging as a spike,
and the surge protectors don't usually catch them - you have to have a line
conditioner in place for that.

Regards,

Mike

On 9/1/09 11:12 AM, "Michael Ulitskiy" <mulitskiy at acedsl.com> wrote:

> I forgot to mention that after the 1st wave of failures we have installed
> tripp lite 
> surge protectors on all circuits. These last failures happened with tripp
> lites installed,
> so it shouldn't be transients.
> 
> The events are random.  Happened during daytime, night-time, weekdays,
> weekend. 
> I can't see any pattern.
> 
> Moving out is a last recourse which I hate to think about, but sure is an
> option that's being considered.
> Just been there half a year ago.
> 
> Michael
> 
> On Tuesday 01 September 2009 01:39:36 pm Scott Granados wrote:
>> Are these random events?  Have you mapped the failures against any sort of
>> power testing / maintenance that the provider is conducting?  We used to
>> blow power supplies in an XO facility in San Francisco and found out after
>> some digging that their power folks were crack smokers, not professionals
>> and were the actual cause of the failures  You might also want to make sure
>> the backup power is sized properly.  I have a client now that lost several
>> 6500 supplies after a power failure in the bay area because their UPS system
>> went crazy under far to much load.  Sounds like transients to me!
>> 
>> ----- Original Message -----
>> From: "Seth Mattinen" <sethm at rollernet.us>
>> To: <cisco-nsp at puck.nether.net>
>> Sent: Tuesday, September 01, 2009 10:21 AM
>> Subject: Re: [c-nsp] Multiple power supply failures. Advise needed
>> 
>> 
>>> Michael Ulitskiy wrote:
>>>> Hello,
>>>> 
>>>> After a little pause it started happening again and we lost 2 more power
>>>> supplies
>>>> (this time in servers) during last week.
>>>> Can anybody advice on a good organization that could do independent power
>>>> analysis
>>>> in New York, NY?
>>>> Thank you,
>>>> 
>>> 
>>> Unfortunately I don't (I'm in Reno, NV). What did your provider have to
>>> say?
>>> 
>>> Also, Gert just posted here about adding a grounding lug to the chassis
>>> solving random reboots. Perhaps you can try that, too. It won't hurt.
>>> 
>>> ~Seth
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> 
> 
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