-=PCTechTalk=- Re: Question about UPS and figuring how much I need....
- From: ronslanding <ronslanding@xxxxxxxxxx>
- To: pctechtalk@xxxxxxxxxxxxx
- Date: Wed, 8 Jan 2003 12:57:11 -0800 (PST)
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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