-=PCTechTalk=- Re: Question about UPS and figuring how much I need....
- From: Billy64300@xxxxxxx
- To: pctechtalk@xxxxxxxxxxxxx
- Date: Wed, 8 Jan 2003 20:13:28 EST
Sorry Ronslanding you missed the point,I don't have the problem,someone asked
how to calculate the electrical demand and I gave a generic answer,the bigger
the wire ,the less resistance,at the last outlet,like the puter.
I've re-wired many homes in the South Jersey area,mostly they bought a house
with a breaker box up to code at the time the house was built.
In a message dated 1/8/03 5:35:47 PM Eastern Standard Time,
ronslanding@xxxxxxxxxx writes:
> Hi Billy!
>
> Don't know the origin of this error but you must have a 12-3 line/cord in o=
> rder for computer equipment, etc to be properly grounded - postive, negativ=
> e and ground. And, in lot of areas house wiring is only 14-2 or 14-3. Thi=
> s means buying the 12-3 would not be much advantage because the house wire =
> would and should have a 15 amp limit (unless its on the glass fuse and some=
> dummy ups it to a 20 amp fuse which could cause a fire if shorts out). IF=
> you had to run an extension cord for say 20, 25 or 50 feet you might want =
> to use 12-3 wire cord to cut down loss due to electrical resistance encount=
> ered in a long extension cord (with a 15 amp fuse). Although most modern e=
> quipment has individual fuse protection you might not want the extension bu=
> s fuse to be above 15 amps depending on what equipment you are going connec=
> t to that line. Another thing to consider-if the house line you connect to=
> is 15 amps and the extension cord fuse is at 20 amps the house line fuse m=
> ay blow first knocking out power to the entire house line including the ext=
> ension cord bus. This may not be desirable in most situations! If the hou=
> se wire is 12-3 with a 20 amp fuse or circuit-breaker a 12-3 wire extension=
> cord bus with a 20 amp fuse might be OK but there is still a chance that t=
> he house circuit-breaker could blow first (although the extension bus fuse =
> should be fast acting, fast enough to blow first).
>
> hth
>
> ronslanding@xxxxxxxxxx
>
> ------- original message -------
> From: Billy64300@xxxxxxx
> Date: Tue, 7 Jan 2003 18:27:17 EST
> Subject: -=3DPCTechTalk=3D- Re: Question about UPS and figuring how much I =
> need....
>
> In a message dated 1/7/03 4:57:52 PM Eastern Standard Time,=20
> BashfulBob@xxxxxxxxxxxx writes:
>
>
> >I am trying to remember how to figure out to guestimate how much you need.
> >>
> >>I remember when I was desiging a compute room almost 20 yrs ago...an
> >>
>
> Always remember more is better,ohms law,you can only send so much electrici=
> ty=20
> through a wire,a 15 amp circuit wired directly to your puter is fine,a 20 a=
> mp=20
> 12-2 is better.At my house the voltage flows so freely i can run two tv's=
> =20
> .ex-box ,ps1,puter system and a hair dryer and still get 120 volts at the=
> =20
> last outlet on the line.
> KVA'S are usually reserved for heavier users like nuke plants.lol
>
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