[ale] OT need 600-1000W power protection for 3 minutes - cheap

[Ron Frazier (ALE)]

Alex Carver <agcarver+ale at acarver.net> wrote:

>On 7/9/2013 13:13, Ron Frazier (ALE) wrote:
>> PS, these ups's only have about 300 joules of surge protection.  I've
>> never understood why.  I would recommend putting a good media room
>surge
>> protector first in line, with a 2000 - 3000 joule surge protection
>> rating, then the ups.
>
>Because when the voltage exceeds the setpoint it disconnects the load 
>from the incoming power and switches to battery.  The low surge 
>suppression is to handle surges that stay within the switching limits.
>
>

I understand what you're saying, but I'm not totally convinced that's enough.  I doubt a 500V 20us transient would trigger a switch over.  Even if it did, it takes 10 mS for the switch.  The transient probably will have already gone through.  But, it could still harm the pc.  The response time of a varister in a surge protector is in nanoseconds so it will trap it.  But, these are cumulative over time and destroy the surge protector.  Since GA has the 2nd highest incidence of lightning in the country, I still like the idea of a big 3000 joule surge  protector sitting there.

Sincerely,

Ron


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Ron Frazier
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