This article was posted 12/08/2008 and is most likely outdated.

Interesting Question from an Engineer
 

 

Subject - Interesting Question from an Engineer

December 8, 2008
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Interesting Question from an Engineer

Mike,

I’d like to ask your opinion on compression couplings versus set screw type. I work for an A & E firm and have been an electric power engineer for 48 years, and counting.  Our company standards call for compression couplings exclusively and have for as long as I know.

 

However, contractors who I respect for their experience and integrity (which is not all of them) state that set screw fittings are equal and in some ways better than compression.  And I think I agree, at least do not disagree, as I do not and never have regarded conduits as grounds. That being the case, I see little reason for compression couplings in most of our projects which are not in areas of high vibration, long vertical runs, long distanced between supports, conduit abuse, etc.

 

Your thoughts would be welcome.

 

Thanks, Kevin Cassidy

 

Mike Holt’s Response: Kevin, I never could figure out why compression fittings were part of specifications; to me SS fitting are equal to or better than compression fittings.
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Comments

  • I have been installing zero-fault-tolerant line & LV wiring systems since ... a few decades before the term was coined. Whenever possible, I prefer to use (steel) SS connectors with EMT. There are conditions precluding their use, such as slab, wet & high moisture environments.

    As others have noted, fully tightened set screws will slightly "indent" the tubing wall. However, if the tubing has been properly reamed and fully inserted into the connector, this should not usually present a problem as the indents are sufficiently distanced from the lip of the tubing.

    Nick Arpaia - ARMAC Electric
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