Re: How much Voltage Drop is acceptable for computers? Outdoor Desktop Office
From: Ken Taylor (ken_at_home.nz)
Date: 08/30/04
- Next message: MikeN: "NBFM from DDS chip"
- Previous message: John S. Dyson: "Re: Low voltage hobbyist-accessible microcontrollers?"
- In reply to: ~Dude17~: "Re: How much Voltage Drop is acceptable for computers? Outdoor Desktop Office"
- Next in thread: scada: "Re: How much Voltage Drop is acceptable for computers? Outdoor Desktop Office"
- Messages sorted by: [ date ] [ thread ]
Date: Mon, 30 Aug 2004 17:41:13 +1200
"~Dude17~" <dude17@sacbeemail.com> wrote in message
news:b959931f.0408290844.2ff8ae2c@posting.google.com...
> X-No-Archive: Yes
>
>
> dubspam@yahoo.com (Dubs) wrote in message
news:<e3d356cd.0408281943.5dd6bcb0@posting.google.com>...
> > Hello, I'm not very good with basic electricity, but I'm interested in
> > running a 200 - 250 ft cable, probably Underground UFB cable as
> > opposed to an extension cord. I want to run a 17" monitor, a desktop
> > computer, and 2 or 3 flourescent bulbs. I'm not really to concerned
> > about the lifespan of my computer's power supply or my monitor. That
> > stuff is next to free for me. What I'm more worried about is the
> > money to buy the cable. Is 12 guage cable acceptable? Do I have to
> > use 10 guage? Are there any fire risks involved if this is all
> > plugged into a circuit breaker? Does anybody know about any good
> > deals on cable?
> >
> > Thanks Folks
>
> Computer power supplies are often rated for 90 to 132V and usually
> exactly twice that with switch in 230V position. Many monitors are
> rated for full range 90 to 264V. Use a good power supply though.
> Cheap power supplies often have a narrower tolerance and when you go
> out of the band, your PC will crash or reboot. Because of the way
> computer draws current, power factor is about 0.6. Because it's crest
> factor is so high, peak current can be over 3 to 1. Thin wiring will
> result in high harmonic distortions at the line end making the top and
> bottom of sinewave closer to a shape of mesa.
Not sure where the OP is but assuming he has a 110VAC supply, even with 10
gauge cable, at 250 feet length and assuming a 500W load (which seems about
right for what he's saying), there'll be of the order of 10 volts drop along
the cable. It doesn't sound much but that also means that there'll be about
1W per foot of cable being dissipated 'somewhere': this is a recipe for
disaster.
That length of extension is a job for someone who knows their stuff and can
do it properly - they will probably even be able to source the cable cheaper
than the lay person.
Ken
- Next message: MikeN: "NBFM from DDS chip"
- Previous message: John S. Dyson: "Re: Low voltage hobbyist-accessible microcontrollers?"
- In reply to: ~Dude17~: "Re: How much Voltage Drop is acceptable for computers? Outdoor Desktop Office"
- Next in thread: scada: "Re: How much Voltage Drop is acceptable for computers? Outdoor Desktop Office"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
