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<DIV><FONT face=Arial size=2>Ono je to slozitejsi. Pripustny vykon na jednotku
delky dratu zavisi na pripustne teplote dratu a teplote okoli, na tom jestli je
drat volne ve vzduchu nebo treba na civce, jestli okolni vzduch cirkuluje
... Pokud chcete vyssi zatizitelnost, je vyhodne misto jednoho tlusteho
dratu pouzit vic tencich (lepsi pomer povrch/prurez).</FONT></DIV>
<DIV><FONT face=Arial size=2>Andel</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=gatilo@centrum.cz href="mailto:gatilo@centrum.cz">gatilo</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=hw-list@list.hw.cz
href="mailto:hw-list@list.hw.cz">HW-news</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, July 16, 2006 9:35 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Dovolena proudova
hustota</DIV>
<DIV><BR></DIV>
<P> 16.7.2006, 21:28:32</P>
<P><BR></P>
<P>s Kanthalem vam neporadim, ale pro bezne instalace domovniho typu plati
zhruba 4A/mm2 pro Al, a 6A/mm2 pro Cu. Presne hodnuty zavisy na nekolika
cinitelych a jsou uvedeny v norme jako tabulka.</P>
<P><BR></P>
<P>S pozdravem Pavel</P>
<P> <A class=RVTS6
href="mailto:gatilo@centrum.cz">mailto:gatilo@centrum.cz</A></P>
<P><BR></P>
<P>--</P>
<P>Petr Tosovsky napsal:</P>
<P><BR></P>
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<P><SPAN class=RVTS8>Zdravim vsechny.</SPAN></P>
<P><SPAN class=RVTS8>Neporadil by mi nekdo jakou si muzu dovolit
proudovou hustotu u odporoveho dratu? Mam tu odporovy drat, podle mereni
je to Kanthal (vyslo mi 1,38uOhm.m) s prurezem 2mm2. Potrebuji zjistit
jaky proud jim muze protekat aby nedoslo k prilis velkemu ohrevu (cca
10C by se dalo akceptovat). Bude v prostredi bez cirkulace
vzduchu. </SPAN></P>
<P><SPAN class=RVTS8>V souvislosti s tim me napadlo jestli normy
predepisuji nejakou dovolenou proudovou hustotu pro bezne vodice jako
treba pro pohyblive privody ke spotrebicum, pro elektroinstalaci atd.
Jedine co vim je ze v malych transformatorech se pocita cca
3,5A/mm2. </SPAN></P>
<P><SPAN class=RVTS8>Diky za odpovedi</SPAN></P>
<P><SPAN class=RVTS8></SPAN> </P>
<P><SPAN class=RVTS8>Tosa</SPAN></P></TD></TR></TBODY></TABLE></DIV>
<P><BR></P>
<P><BR></P>
<P> </P>
<P>
<HR>
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