This article was posted 12/08/2008 and is most likely outdated.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

  • As far as poor quality workmanship goes. “neat and workmanlike manner” requirement in 110.12 Coves that. Who is responsible for that on any job, the management, not the worker. Management is mandated by code, employees are mandated by code and management enforces the code. The meaning of “neat and workmanlike manner” requirement in 110.12 is brought to your attention the moment you walk on the job. Keywords....tight, level, plumb, instructions, pay. You do substandard work, you get substandard pay. Have I made myself perfectly clear....good.

    Set Screw verses Compression.

    Set Screw because each and every one can be checked visually, compression can not. From an engineers pespective.... Steel Set Screw.....2 selling points, strong and can be checked visually.

    As far as what I use, if it is mandated to be used then... that's what is installed. If it's not mandated then the least expensive (listed) is used. KISS

    electroman
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