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Article #2283

Re: Supply for LV lighting application?

#2283
From: Wes
Date: Wed, 02 Apr 2003 02:07
55 lines
3928 bytes
#12 wire is rated for 20 amps.  However, you are limited by distance.  I
find, and MANY tables of reference would agree, that considerable voltage
drop is evident after 100 feet, and most INDOOR low voltage applications
should be limited to 30ft... outdoor to max of 100ft.

Wes

(The drop doesn't show up so much 'in the dark'.)


"Watson Ammonium Chloride Name" <alondra101@hotmail.com> wrote in message
news:MPG.18ef8b2bdb02ae1798a127@news.inreach.net...
> In article <Gz7ha.44$5u2.26@newssvr19.news.prodigy.com>,
> wesk@prodigy.net mentioned...
> [...]
>
> > Another issue to consider.  The greatest concern you face with 12v
systems
> > is voltage drop.  If you have LONG runs, this will become a significant
> > problem.  DO NOT use small cable... #12 is the preferred roadway if
running
> > under 75ft (IMO)...  and another issue to consider is amperage.
Remember
> > that #12 cable is good for 20 amps.  I'm sure you're very aware of the
> > formula to figure your max allowable... and I'd urge you to consider no
more
> > than 300 watts on ANY circuit.  DO NOT pump up the transformer in order
to
> > put more fixtures on that circuit.
>
> For 120 VAC, a 5 percent drop is 6 V, but for 12V, it's only 0.6V, so
> you cannot draw as many amps thru a 12 gauge for a given percent drop at
> 12V.
>
>
> > Wes
>
> > "DaveC" <anon@bugus.net> wrote in message
> [snip]
>
>
> --
> @@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
> ###Got a Question about ELECTRONICS?   Check HERE First:###
> http://users.pandora.be/educypedia/electronics/databank.htm
> My email address is whitelisted.  *All* email sent to it
> goes directly to the trash unless you add NOSPAM in the
> Subject: line with other stuff.  alondra101 <at> hotmail.com
> Don't be ripped off by the big book dealers.  Go to the URL
> that will give you a choice and save you money(up to half).
> http://www.everybookstore.com  You'll be glad you did!
> Just when you thought you had all this figured out, the gov't
> changed it: http://physics.nist.gov/cuu/Units/binary.html
> @@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
>
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From: "Wes" <wesk@prodigy.net>
Newsgroups: sci.electronics.design,sci.electronics.misc,alt.engineering.electrical,aus.electronics
References: <0001HW.BA977EAD001869E90E6B7920@news.covad.net> <Gz7ha.44$5u2.26@newssvr19.news.prodigy.com> <MPG.18ef8b2bdb02ae1798a127@news.inreach.net>
Subject: Re: Supply for LV lighting application?
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Date: Wed, 02 Apr 2003 02:07:51 GMT