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<html> <head> <meta content="en-us" http-equiv="Content-Language"> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> <link type="text/css" rel="stylesheet" href="../../../../../css/ccna.css"> <script src="../../../../../js/framesetHelper.js" language="JavaScript"></script><script language="JavaScript"> window.scrollTo(0,0); function newPage(pageID) { alert("COMMING SOON!!\nThis feature is currently in development."); } function launchMoreInfo(oid) { dash = oid.indexOf('-'); sub1 = oid.substring(0,dash); sub2 = oid.substring(dash+1); // this is an URL base on the // system that generated the static // download of the curriculum. httpref = "http://nomar.sdf.cisco.com/servlet/org.cli.delivery.rendering.servlet.MIServlet/Static=true,LMSID=DTUI,Engine=dynamic,Theme=cnamstheme,Style=ccna,Language=en,Version=2,RootID=knet-v214aCV47051/CHAPID=null/RLOID=null/RIOID=null/"; newref = httpref + sub1 +"/"+ sub2 +"/moreinfoframeset.html"; //alert("new newref :\n" + newref); window.open(newref,'MoreInfo','toolbar=no,status=yes,menubar=no,location=no,scrollbars=yes,height=442,width=756,left=20,top=20,resizable=yes') } function launchContentResource(contentID) { top.currentSupport = 0; 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Remember that all voltages (electrical potential differences) are measured between two points, so you must define what those two points (hot and ground; hot and neutral; neutral and ground) are when discussing potential voltage problems.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>There are three wires in a power cable, and problems that occur in the cable are labeled according to the particular wire(s) that are affected. If a situation exists between the hot and neutral wire, this is referred to as a <i>normal mode</i> problem. If a situation involves either the hot or neutral wire, and the safety ground wire, it is referred to as a <i>common mode</i> problem.</p><p>Following is an explanation of the power problem code, as shown in the figure. In the first line the tan dot indicates that the ground wire is not connected. In line two, the tan dot indicates that the neutral wire is not connected. In line three, no dot is indicated, showing that the hot wire is not connected. In the next two lines the blue and white dot indicate which lines are reversed, and the final line indicates that the line has no power connections problems.</p></td> </tr> </table> </td> </tr></table> <p> </p> <table width="100%" cellspacing="0" cellpadding="2" border="0" valign="bottom"> <tr> <td></td> </tr> </table> </body></html>⌨️ 快捷键说明
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