This article was posted 12/08/2008 and is most likely outdated.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 in the contracting and engineering side for over 30 years and have had the same experience both installing and specifying fittings. Set -screws are absolutely and equal in my opinion. Further, with a set-screw connector you can readily identify if a fitting has been tightened by looking at the screws. With a compression connector this is not always the case. Also, in my experience doing inspections, a compression connector requires two wrenches to properly tighten. I have found many compression connectors that have been hand tightened only and are easily opened. A set-screw fitting requires only a screw-driver which all electricians carry as oppossed to two wrenches ( Channel locks). The additional cost for compression connectors is also not warranted in most cases unless required for a specific situation.

    Wayne
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