Jeff Beck Posted May 4, 2010 Report Share Posted May 4, 2010 Yesterday's inspection. 100 amp panel, I couldn't find any evidence of moisture penetration around the panel or in the basement. Would you report on this amount of rust ? Click to Enlarge 117.31 KB Quote Link to comment Share on other sites More sharing options...
Marc Posted May 4, 2010 Report Share Posted May 4, 2010 I might mention it, nothing more. Marc Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted May 4, 2010 Report Share Posted May 4, 2010 Was it mounted directly to a foundation wall - below grade? Quote Link to comment Share on other sites More sharing options...
Jeff Beck Posted May 4, 2010 Author Report Share Posted May 4, 2010 Yes Bill, it was mounted directly to a poured concrete foundation wall, below grade. Are you thinking condensation? Quote Link to comment Share on other sites More sharing options...
Bill Kibbel Posted May 5, 2010 Report Share Posted May 5, 2010 I seem to remember a 1/4" air space is required to prevent moisture/condensation/rust. All but just a few here have plywood between the enclosure and the wall instead. Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted May 5, 2010 Report Share Posted May 5, 2010 That doesn't look like an old panel so this rust thing is likely to get worse and worse. What Bill said. An air space is needed. NEC 312.2(A) Quote Link to comment Share on other sites More sharing options...
Ben H Posted May 5, 2010 Report Share Posted May 5, 2010 That doesn't look like an old panel so this rust thing is likely to get worse and worse. What Bill said. An air space is needed. NEC 312.2(A) Even if you space it now, would it be too late? The rust is gonna keep going right? Quote Link to comment Share on other sites More sharing options...
Marc Posted May 5, 2010 Report Share Posted May 5, 2010 Right. It won't stop once it begins, because the paint seal is now broken. Marc Quote Link to comment Share on other sites More sharing options...
Jim Port Posted May 6, 2010 Report Share Posted May 6, 2010 I seem to remember a 1/4" air space is required to prevent moisture/condensation/rust. All but just a few here have plywood between the enclosure and the wall instead. There are normally dimples built into the panel to provide the air gap. Quote Link to comment Share on other sites More sharing options...
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