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#89125 - 09/03/04 04:07 PM Cables in suspended ceiling  
Bill39  Offline
Member
Joined: Nov 2001
Posts: 75
Indianapolis, IN, USA
I'd like some opinions on if this type installation would meet the NEC:

Short version: When can shielded cables be ran in a suspended ceiling and not be in a raceway? Two types of cables, one with 120VDC for small motors and other is 24VDC for sensors, & encoders.

Long version:
Have a large custom control panel (120VAC max) and some test stands w/small DC motors, encoders, and sensors. All are in a lab/testing room. We need to run shielded cables between the control panel and test stands. Conduits (1 for low voltage & 1 for 120VDC) will extend up into a suspended ceiling and end. In the ceiling the cables are to be supported by the metal joists, and ty-rapped together.


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#89126 - 09/03/04 04:34 PM Re: Cables in suspended ceiling  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
Two questions spring to mind, is this a fire rated ceiling and is this a plenum for return air?


Greg Fretwell

#89127 - 09/03/04 04:38 PM Re: Cables in suspended ceiling  
iwire  Offline
Moderator
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Are these cables a chapter 3 wiring method?


Bob Badger
Construction & Maintenance Electrician
Massachusetts

#89128 - 09/04/04 12:20 PM Re: Cables in suspended ceiling  
hbiss  Offline
Member
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Not so much as would they need to be run in a raceway but what is the required wiring method. I doubt any would have to be run in raceway if the correct wiring is used.

Even with raceway you will have to determine whether these circuits are CL1, 2 or 3 and proceed from there. If any are CL1 you may not be able to use the wire you have even with raceway.

-Hal



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