This article was posted 12/08/2008 and is most likely outdated.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 am retired from the Federal Aviation Administration and they also have a standard that requires compression fittings only. For the better part of 30 years I have also tried to figure as to why. The same standard also requires a seperate ground wire which negates the use of the raceway as a ground as noted by Mr. Cassidy. I personally prefer the SS fittings, especially for larger pipe, since it will more likely be made up as a continuous system as required due to the fact that the screws are more accessable than getting a large pair of pliers onto the fitting to insure tightness.

    Mikey
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