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Marco,<br>
<br>
Take a look at 2008 NEC 310.15(4)(a). The neutral conductor isn't
counted for the purpose of NEC 310.15(B)(2)(a) when it is part of a
circuit where it only carries the unbalanced current.<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
<br>
<br>
Marco Mangelsdorf wrote:
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<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Thanks
for sending that link, William.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">OK…let’s
try it from a different perspective.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">When
you’re running, say, three three-phase hot conductors from
point A to point B with a neutral conductor, should that neutral be
considered “current
carrying” from the perspective of more than three “current carrying”
conductors
in a raceway? And thereby necessitating de-rating the current carrying
capacity of the hot conductors?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">marco</span><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Marco:<br>
<br>
You have opened a can of worms. I hope you are happy!<br>
<br>
Are you looking for the legal definition or to discover if the neutral
conductor actually carries current? The answer to the legal definition
is
in 310.15(B)4 (2002), and the answer is: It depends (on the type of
service). This on-line article sums it up well: <a
moz-do-not-send="true"
href="http://ecmweb.com/nec/code-basics/electric_conductor_size_matters/">http://ecmweb.com/nec/code-basics/electric_conductor_size_matters/<br>
<br>
</a>William Miller<br>
<br>
PS: In my opinion, the neutral is a current carrying conductor in any
system. Disconnect it at your peril.<br>
<br>
William<br>
<br>
<br>
<br>
At 02:41 PM 5/13/2010, you wrote:<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Content-Type: multipart/alternative;<br>
boundary="----=_NextPart_000_0078_01CAF291.3BA43F40"<br>
Content-Language: en-us<br>
<br>
I have a disbelieving business partner who believes that the neutral
conductor
in a standard 120/240VAC service is a current carrying conductor.<br>
<br>
Could someone please disabuse him of that notion?<br>
<br>
Thanks,<br>
marco<br>
<o:p></o:p></p>
<p><span style="font-size: 10pt; font-family: "Arial","sans-serif";">No
virus
found in this incoming message.<br>
Checked by AVG - <a class="moz-txt-link-abbreviated" href="http://www.avg.com">www.avg.com</a><br>
Version: 9.0.819 / Virus Database: 271.1.1/2870 - Release Date:
05/12/10
20:26:00</span><o:p></o:p></p>
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No virus found in this incoming message.
Checked by AVG - <a class="moz-txt-link-abbreviated" href="http://www.avg.com">www.avg.com</a>
Version: 9.0.819 / Virus Database: 271.1.1/2871 - Release Date: 05/12/10 23:26:00
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