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Article #2283Re: Supply for LV lighting application?
From: Wes
Date: Wed, 02 Apr 2003 02:07
Date: Wed, 02 Apr 2003 02:07
55 lines
3928 bytes
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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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 112d1e,8548d564104ce958 X-Google-Attributes: gid112d1e,public X-Google-Thread: 10d137,8548d564104ce958 X-Google-Attributes: gid10d137,public X-Google-Thread: 103407,8548d564104ce958 X-Google-Attributes: gid103407,public X-Google-Thread: 107cee,8548d564104ce958 X-Google-Attributes: gid107cee,public X-Google-ArrivalTime: 2003-04-01 18:08:10 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!newsfeed.stanford.edu!logbridge.uoregon.edu!arclight.uoregon.edu!wn13feed!wn12feed!wn14feed!worldnet.att.net!207.115.63.142!prodigy.com!newsmst01.news.prodigy.com!prodigy.com!postmaster.news.prodigy.com!newssvr15.news.prodigy.com.POSTED!9448416d!not-for-mail 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? Lines: 57 X-Newsreader: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <XBria.305$3Y7.27949154@newssvr15.news.prodigy.com> NNTP-Posting-Host: 12.227.90.41 X-Complaints-To: abuse@prodigy.net X-Trace: newssvr15.news.prodigy.com 1049249271 ST000 12.227.90.41 (Tue, 01 Apr 2003 21:07:51 EST) NNTP-Posting-Date: Tue, 01 Apr 2003 21:07:51 EST Organization: Prodigy Internet http://www.prodigy.com X-UserInfo1: OP\YRWKDUCRWSQXYGZJVNQMAPJYREQLIQQ]ZMVMHQAVTUZ]CLNTCPFK[WDXDHV[K^FCGJCJLPF_D_NCC@FUG^Q\DINVAXSLIFXYJSSCCALP@PB@\OS@BITWAH\CQZKJMMD^SJA^NXA\GVLSRBD^M_NW_F[YLVTWIGAXAQBOATKBBQRXECDFDMQ\DZFUE@\JM Date: Wed, 02 Apr 2003 02:07:51 GMT