[Novalug] UPS a/o surge protector doubling??
energy.wwind at cox.net
Tue Mar 17 12:48:01 EDT 2009
1) There is always a circuit breaker 'in the wall' for every duplex
outlet. Typically 5 outlets per circuit.
2) Duplex outlets are typically 15 amp 120 Volt AC with 14 gauge
wire in the wall.
3) Some buildings / homes have 12 gauge wire "Romex" in these circuits.
4) Some buildings / homes have dedicated 20 amp circuits that only
go to one single plug.
5) The 20 amp dedicated circuits always have 12 gauge wire, and
most have Ground Fault Interrupt
circuit breakers either at the fuse box or outlet. "GFI"
6) Surge Power Strips can be connected in series, no problem.
7) UPS's cannot be connected in series. They effectively have an
internal frequency. When two UPSs
have almost identical frequencies ( i.e. same mfg, model )
they "beat" their frequencies against
each other and........ they trip each other; or they trip
waaay slower than individually, putting the KFC on unsuspecting
If you want to operate during dead air, put the largest UPS on the
computer alone. Put the smaller UPS on the cable modem, screen,
printer. Do not put a laser printer on a UPS. Its surge to warm up will
ruin the UPS.
Better yet get a laptop with a swapable media bay like the Dell D830.
Its media bay can swap a second battery with a CD-RW, DVD+-RW, etc.
Keep the 2nd battery fully charged and next to the computer which is
plugged into the large UPS. Now you're ready for 6+ hours of dead air.
John Franklin wrote:
> When I was living in NC, we had a facilities manager who would allow
> power strips connected in series, but not an extension cord with a
> power strip at the end. Something about fire codes I never quite
> fully understood. The gist of it was with power strips in series each
> link has its own breaker, but an extension cord does not. He held
> this policy even when there is a breaker in the wall and a breaker on
> the power strip. I suspect his policy was more to prevent a thousand
> extension cords strung everywhere like spaghetti making it impossible
> for him to tell what was plugged in where.
> On Mar 17, 2009, at 10:41 AM, bvoight at patriot.net wrote:
>> I'm not sure if it's common practice for surge protectors, but one
>> quality surge protector will do the job. I had a TrippLite surge
>> protector on my stuff about 12 years ago that took a lightning hit.
>> surge protector fried, but none of my equipment was damaged. All I
>> out was the cost of the surge protector.
>> So far as UPS's go, I believe serial is a no-no. Startup voltages
>> the second one in line might cause problems in the UPS closest to the
>> power source. If your device has multiple power supplies, it's common
>> practice to hook the PS's to different UPS's.
>> You should also put surge protection on any other line attached to
>> devices (modem, cable, etc.).
>> HowStuffWorks has some good info.
>>> On Tue, 17 Mar 2009, Bonnie Dalzell wrote (in connection with a
>>> different topic)
>>>> [...] This was the UPS/surge protector that was closer to the
>>>> computer (i had one plugged into a next one which in turn plugs
>>>> into the wall) the one closer to the wall died last summer
>>>> after the visit from the lightening and was replaced. [...]
>>> Is it common practice to use UPSs (or maybe just surge
>>> protectors?) in series? Do you really get increased security
>>> that way? It sure sounds like Bonnie did, and expects to again
>>> Beartooth Implacable
>>> Death is not evil. Suffering is evil.
>>> Guns are not evil. Tyranny is evil.
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