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<p>[QUOTE=&quot;desertgem, post: 931082, member: 15199&quot;]Only if the metal is not grounded to the microwave tube. The early &quot;Radar ranges&quot; had metal lined cavities and metal racks, which were connected to produce a ground, and thus no problem. But a piece of metal in the cavity, not grounded will arc as microwaves ionize the air inside, and the charged ions will react and try to get to ground. Most cavities are plastic today, so melting of the plastic can occur, or the arc blows the microwave fusible link which is hard to find and replace, so most people throw it away then.IMO.</p><p style="text-align: left"><span style="color: #000000"><br /></span></p> <p style="text-align: left"><span style="color: #000000"><br /></span></p><p>[/QUOTE]</p><p><br /></p>

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