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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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Human beings conduct electricity, and if they should accidentally become part of a live electrical circuit, they can be harmed. The purpose of safety ground connections is to hopefully form a different circuit of less resistance than the human body. This is so that electrons take the path of least resistance (to ground) and not through the human's body.</p> </span></td> </tr> </table> </td> </tr> </table> </td> </tr> </table><p>An example of a wiring fault that could occur in a network device is an accidental connection between the hot wire and the chassis. If such a fault were to occur, the safety ground wire connected to the device would serve as a low resistance path to the earth ground. When properly installed, the low resistance path provided by the safety ground wire would offer sufficiently low resistance and sufficient current-carrying capacity as to prevent the build up of hazardously high voltages. Also, because the circuit would then directly link the hot connection to ground, any time electrical current passed via this path into the ground, it would cause protective devices such as circuit breakers to activate. By interrupting the circuit to the transformer, circuit breakers stop the flow of electrons, thus reducing the risk of electrocution.</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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