Conduit and Tubing: Do these words mean things?

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Jraef said:
Maybe you didn't get to the end...
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I did, but thank you for putting the text up. It says....
Conduit and tubing are two different wiring methods that differ in application and installation requirements, although neither is defined by the Code.
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but it doesn't say why. The only difference is the word tubing.

Throw any other raceways into that sentence and it reads true...

PVC and metallic flex are two different wiring methods that differ in application and installation requirements, ....

Rigid and non metallic flex are two different wiring methods that differ in application and installation requirements,....
 
zbang said:
Also, thin-wall circular metal shapes are often called tubing and thicker-walled ones pipe.
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This is off-topic since it is not made for containment of electrical conductors, but I worked extensively in plants which made steel rectangular tubing. The product line running the last day I was there was 5" x 3" x 0.500" wall.

I cannot think of a single unique qualifier to distinguish between tube and pipe.
 
As it seems everyone has had their chance to comment, I can confidently say that this is still clear as mud. :)

- Although not defined, the NEC does distinguish between the two at times, but where it does, doesn't make total sense. See #4 and #15
- M-W dictionary defines conduit with "tube" as one of the options. See post #1
- The EMT name does have historical significance, and was actually referred to as a type of conduit when it first came out. See #16
- There are very reputable folks that cite the difference but it's still unsure on why. See #5
 
Pipe is measured from the inside diameter...... Tubing is measured form the outside dimension..

1/2 tubing should theoretically fit inside 1/2 pipe ????
 
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