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Old 04-17-2011, 10:21 PM   #16
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Expansion joints for electrical conduit

You can actually get expansion joints for EMT as well, i have never had to use one though.


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Old 04-17-2011, 10:32 PM   #17
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Expansion joints for electrical conduit

Although they are listed as required in the NEC book, the circumstances where they would be needed in any residential installation would be rare...if not non-existant. Only under extreme temperature changes and excessive lengths are they required, and not in burial situations.
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Old 04-19-2011, 04:16 AM   #18
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Expansion joints for electrical conduit

Its need is more common that you think. The code states an expansion joint “shall be provided” in straight runs between securely mounted items with an expected expansion of ”. A 20' straight run that’s mounted on the side of a house with a 40 degree temperature change would require an expansion joint.


Last edited by hpp58; 04-19-2011 at 05:22 AM. Reason: Word Change
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