Running Air Tubing In Wireway With Wires
- Thread starter bobhudon
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tony_psuee
Senior Member
- Location
- PA/MD
Re: Running Air Tubing In Wireway With Wires
Bob,
I do not see anything that specifically allows or disallows this, articles 300 and 310. However, from a design standpoint what would cause the tubing to break? For lack of better terms, a trauma to the wireway that is sufficient to break the air tubing would almost certainly also do some damage to the conductors. If the air carried through the tubing is caustic enough to erode it than I would also believe it would attack the insulation of the wiring. Even without the tubing the wireway could be subject to developing condensation through normal heating and cooling associated with ambient conditions. With the proper wire and insulation intact that should not be an issue. The only question I would raise on code application is with the addition of the tubing, does the wireway have to be recalculated for fill? The tubing is not carrying current, and therefore not dissipating additional heat, unless it is carrying hot air, like me with the post. However, it is taking up open space in the conduit. Is this a none issue?
I hope some of the more experienced members with industrial background will join in on this one.
Tony
Bob,
I do not see anything that specifically allows or disallows this, articles 300 and 310. However, from a design standpoint what would cause the tubing to break? For lack of better terms, a trauma to the wireway that is sufficient to break the air tubing would almost certainly also do some damage to the conductors. If the air carried through the tubing is caustic enough to erode it than I would also believe it would attack the insulation of the wiring. Even without the tubing the wireway could be subject to developing condensation through normal heating and cooling associated with ambient conditions. With the proper wire and insulation intact that should not be an issue. The only question I would raise on code application is with the addition of the tubing, does the wireway have to be recalculated for fill? The tubing is not carrying current, and therefore not dissipating additional heat, unless it is carrying hot air, like me with the post. However, it is taking up open space in the conduit. Is this a none issue?
I hope some of the more experienced members with industrial background will join in on this one.
Tony
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: Running Air Tubing In Wireway With Wires
this has come up in a previous post> I asked mike holt and he said he felt 725.3 would allow it, but this was a low voltage application.
My first comment is the air tubing would may have to be listed, the same as wire or optical fiber.
this has come up in a previous post> I asked mike holt and he said he felt 725.3 would allow it, but this was a low voltage application.
My first comment is the air tubing would may have to be listed, the same as wire or optical fiber.
joe tedesco
Senior Member
- Location
- Boston, Massachusetts
Re: Running Air Tubing In Wireway With Wires
See the 2002 NEC
See the 2002 NEC
pierre
Senior Member
- Location
- Westchester County, New York
Re: Running Air Tubing In Wireway With Wires
Is the wireway that is discussed here Articles 376, and 378, 2003 NEC?
If so I would say this is a listing issue. Is the air tubing listed to be run in a wireway? Is the wireway listed for use with this particular tubing and its application?
Pierre
Is the wireway that is discussed here Articles 376, and 378, 2003 NEC?
If so I would say this is a listing issue. Is the air tubing listed to be run in a wireway? Is the wireway listed for use with this particular tubing and its application?
Pierre
pierre
Senior Member
- Location
- Westchester County, New York
Re: Running Air Tubing In Wireway With Wires
Looking a little further, and Wireways are defined in Article 100 as raceways.
Raceways - An enclosed channel of metal or nonmetallic materials designed EXPRESSLY for holding wires, cables, or busbars, with additional functions as permitted in this Code.
I cannot locate elsewhere in this Code where it would permit this type of installation. I say it is not permitted.
Pierre
Looking a little further, and Wireways are defined in Article 100 as raceways.
Raceways - An enclosed channel of metal or nonmetallic materials designed EXPRESSLY for holding wires, cables, or busbars, with additional functions as permitted in this Code.
I cannot locate elsewhere in this Code where it would permit this type of installation. I say it is not permitted.
Pierre
tony_psuee
Senior Member
- Location
- PA/MD
Re: Running Air Tubing In Wireway With Wires
Joe,
Thanks for the correction. It shows my need to review the entire article, not just rather were I expect the answer would be.
Tony
Joe,
Thanks for the correction. It shows my need to review the entire article, not just rather were I expect the answer would be.
Tony
joe tedesco
Senior Member
- Location
- Boston, Massachusetts
Re: Running Air Tubing In Wireway With Wires
Tony:
My pleasure, that rule has been in the NEC for about 5 code cycles.
CMP 3 was trying to settle the issue in a Proposal related to different systems in the same trench, which is or may be covered in mechanical and plumbing codes, and 300.8 is the result of their actions.
Tony:
My pleasure, that rule has been in the NEC for about 5 code cycles.
CMP 3 was trying to settle the issue in a Proposal related to different systems in the same trench, which is or may be covered in mechanical and plumbing codes, and 300.8 is the result of their actions.
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