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#40970 - 08/11/04 05:16 PM Air hose in conduit ?
derater Offline
Member
Registered: 03/30/02
Posts: 179
My mechanic has an old semi-trailer he uses for storage and wants circuit to it for compressor and air line back to shop.Legal/safe to have air line in same tube? Run is about 40'
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#40971 - 08/11/04 06:03 PM Re: Air hose in conduit ?
Joe Tedesco Offline
Member
Registered: 10/07/00
Posts: 2749
Loc: Boston, Massachusetts USA
300.8 Installation of Conductors with Other Systems.

Raceways or cable trays containing electric conductors shall not contain any pipe, tube, or equal for steam, water, air, gas, drainage, or any service other than electrical.
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Joe Tedesco, NEC Consultant
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#40972 - 08/11/04 06:17 PM Re: Air hose in conduit ?
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
In same tube? How?

A hose and a cable, in a condiut, NO WAY!

A rigid pipe for air, and 1/2' RMC for power in a trench maybe...
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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#40973 - 08/11/04 06:19 PM Re: Air hose in conduit ?
e57 Offline
Member
Registered: 05/27/03
Posts: 2876
Loc: S.F.,CA USA
I was looking for that when you posted Joe...
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Mark Heller
"Well - I oughta....." -Jackie Gleason
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#40974 - 08/12/04 12:53 PM Re: Air hose in conduit ?
walrus Offline
Member
Registered: 07/25/02
Posts: 680
Loc: Bangor Me. USA
It would be easy to snake a 1/2 in nylon tube into the same pipe you ran wires in to run the compressor. Of Course it wouldn't be legal so why not just run 2 pipes, one for air, one for wires.
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#40975 - 08/12/04 07:18 PM Re: Air hose in conduit ?
Active 1 Offline
Member
Registered: 02/22/03
Posts: 687
Loc: Grayslake IL, USA
Air hoses don't last more than a few years if used. If the hose blew in a conduit it could blow something apart like the cover. I seen some shops run compressed air pvc pipe. It works for a bit then it will explode with shrapnel.

The worst I seen is when someone tried to make an air storage tank. It was about 4x2' with 175 psi in a storage room. On day the end blew off. It flatened a tool box, some shelves. The outside sheet metel wall was bowed out. All drywall was cracked and broken. It took out the light bulbs too.

I would only use ridgid for air. Something elce to think about is water colects at the lowest point in air lines. Sometimes they have drains for this.

Tom
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#40976 - 08/12/04 07:36 PM Re: Air hose in conduit ?
DougW Offline
Member
Registered: 06/08/03
Posts: 1143
Loc: North Chicago, IL
Tom brings up a good point. My FD forgot to run "drainage drops" when they installed shoreline air reels for the vehicles. Now we have to bleed the tanks weekly.

I'd run galvanized steel plumbing pipe (AKA RMC) for the air, and a separate conductor raceway.
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#40977 - 08/12/04 10:23 PM Re: Air hose in conduit ?
NORCAL Offline
Member
Registered: 09/25/02
Posts: 865
Copper works well for air lines my shop has been plumbed w/ copper for 11 years under the slab troublefree plus sweat joints are easier than threading steel pipe.
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#40978 - 08/15/04 05:04 AM Re: Air hose in conduit ?
derater Offline
Member
Registered: 03/30/02
Posts: 179
Thanks for the replies-I needed to back up my position with the owner-used 2-2" tubes.
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#40979 - 08/15/04 09:41 AM Re: Air hose in conduit ?
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: West-Southern Inner-Northeast ...
 
There may be trouble even ducttaping the air to the side of a raceway. Reference 300-11(b) Raceways Used as Means of Support.
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