[mythtv-users] Power outages and UPSs

Michael T. Dean mtdean at thirdcontact.com
Mon Jul 30 20:41:09 UTC 2007

On 07/29/2007 11:33 PM, f-myth-users at media.mit.edu wrote:
> Is your power exceptionally spiky?  APC UPSes have surge clamps in
> them, but simple MOV-based clamps can only absorb so many joules over
> their lifetimes before becoming useless (they can get "used up"); I
> don't actually know how the APC clamps are implemented in any given
> UPS.  [I ask because we had an issue in a lab once where a 480V feed
> started arcing and generally playing hell w/the 120V feeds; that
> caused permanent damage to some UPSes and soft upsets to others.]

That sounds like a very real possibility.  Florida is, after all, the
lightning capital of the US.  Though I almost always have power, I get a
lot of spikes (with both the up and the down that follows--I've heard
the down is usually worse on electronics).


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