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#40970 08/11/04 08:16 PM
Joined: Mar 2002
Posts: 179
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derater Offline OP
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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'

#40971 08/11/04 09:03 PM
Joined: Oct 2000
Posts: 2,749
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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.


Joe Tedesco, NEC Consultant
#40972 08/11/04 09:17 PM
Joined: May 2003
Posts: 2,876
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e57 Offline
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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...


Mark Heller
"Well - I oughta....." -Jackie Gleason
#40973 08/11/04 09:19 PM
Joined: May 2003
Posts: 2,876
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e57 Offline
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I was looking for that when you posted Joe...


Mark Heller
"Well - I oughta....." -Jackie Gleason
#40974 08/12/04 03:53 PM
Joined: Jul 2002
Posts: 680
W
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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.

#40975 08/12/04 10:18 PM
Joined: Feb 2003
Posts: 687
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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

#40976 08/12/04 10:36 PM
Joined: Jun 2003
Posts: 1,143
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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.

#40977 08/13/04 01:23 AM
Joined: Sep 2002
Posts: 920
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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.

#40978 08/15/04 08:04 AM
Joined: Mar 2002
Posts: 179
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derater Offline OP
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Thanks for the replies-I needed to back up my position with the owner-used 2-2" tubes.

#40979 08/15/04 12:41 PM
Joined: Apr 2002
Posts: 2,527
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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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