N
[email protected]
- Jan 1, 1970
- 0
interesting rant about 'earth' grounding. its not as if such transients
actually can be 'sunk to ground anyway, its a bit of a myth. he is right
about one thing though, a whole house protector makes a lot more sense.
Only one problem with a lot of "whole house" suppressors.
They handle the noise coming in from outside - but do little about
harmonics and transients generated inhouse.
Digital power supplies are inherently noisy - good ones don't let much
noise out onto the line, but with the "engineered by accountants"
products generally "procured by accountants" the noise fed back onto
the grid, or in the case of a whole house suppression protected
building, into the wiring of the house or office, is significant.
A Dual Conversion UPS does not suppress this noise, it totally blocks
it. Keeps the "house" line totally clean - and does not let the sags,
spikes, and phase shifts caused by process machinery, photocopiers,
airconditioners, etc get close to the system power supplies.
Even a good "line interactive" UPS is a help. Since putting ALL of the
computers in the office onto UPS, with the servers on dual conversion,
we have not suffered a motherboard, processor, or ram failure in over
a year. We were averaging one every 3 months or so prior. The Fujitsu
MPG hard drives continued to die untill we had them all replaced - put
they were a known problem - and we have still lost a few of the "dirt
cheap" ATX power supplies ( 2 this year), instead of 4 or 5 last year.
Usually power line noise and irregularities do not kill a computer
outright, but they degrade components until one day a cap shorts, or a
diode lets go, or a processor gasps it's last and you have an
"unexplained" failure.
Over the 16 years I've been in the IT business, power has become
progressively worse - with more and larger anomolies.