shishile 发表于 2007-12-15 17:30:28

明设的防雷引下线接近地面时为什么要加保护？

<p>如题，多谢</p>

diandao999 发表于 2007-12-17 08:26:59

<p>如题，多谢</p><p> </p><p>&nbsp;</p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">回楼主：</span></p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">明敷防雷引下线加保护一般在地上1.7米、地下0.3米处；主要是<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在易受机械损坏的地方，加保护管后可防止防雷引下线受机械外力而损坏；</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;">在人们能接近的地方．加绝缘保护（套硬塑料管或包缠绝缘材料），一旦雷击时，可减小接触电压。</span><span lang=EN-US><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp; </font></span></span></p></span>

hxw 发表于 2008-3-15 01:48:20

好顷

zhangenwei 发表于 2008-3-30 23:11:20

kdfjvkadjsfkj

菲菲 发表于 2008-4-1 13:15:44

<p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">明敷防雷引下线地上</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman"> 1.7m </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">至地下</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman"> 0.3m </font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">的一段加保护措施的目的有两个：（</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman">1</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">）在易受机械损坏的地方，加保护管后可防止防雷引下线受机械外力而损坏；（</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman">2</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">）在人们能接近的地方．加绝缘保护（套硬塑料管或包缠绝缘材料），一旦雷击时，可减小接触电压。</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman"> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></font></span></font></p><p class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><font size=3><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt">在工矿企业，防雷引下线设在人们不易接近的地方。为防止防雷引下线受到机械外力，可用角钢或钢管加以保护．当用钢管保护时，钢管两端，应把钢管管口和防雷引下线焊成一体，如不焊接，则雷击时，钢管感应电抗大，不利把雷引到地下；钢管的上口应封口．防止管内积水。</span><span lang=EN-US style="mso-bidi-font-size: 10.5pt; mso-font-kerning: 0pt"><font face="Times New Roman"> <o:p></o:p></font></span></font></p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">在住宅区，防雷引下线应用硬塑料管保护，塑料管的上口亦应封口。保护管或保护角钢应用铁卡子固定在墙上．铁卡子离地面或离保护管上口的距离为</span><span lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">300mm</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，铁卡子一般用</span><span lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"> 25mm×4mm </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-bidi-font-family: &#39;Times New Roman&#39;; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">锌扁钢加工。</span>
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