Dell Plans 3rd U.S. Plant, to Hire 1,500 &lt;p&gt;\&lt;/p&gt;&lt;p&gt; By Eric Auchard&lt;/p&gt;&lt;p&gt; NEW YORK (Reuters) - Dell Inc. &lt;DELL.O&gt; plans to open a\third U.S. manufacturing plant, the world's largest personal\computer maker, said on Tuesday, in a rare example of a\high-tech company expanding U.S. production.&lt;/p&gt;