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Viking Bob
Participant

Join Date: Apr 2008
Location: United States, Virginia
Posts: 1

Technician

04/12/2008 7:46 PM

I am trying to determine if standard power cords for displays, UPS, computers etc.. are allowed in a plenum? I have read the NEC and I am a little confused regarding standard factory made power cords. I have an area under a raised deck that is used for ventillation in the space. I have outlets in the plenum area that are ran using either metal jacket MC cable or sealtight. I have 3 inch holes in the raised deck that I run the power cords through to plug into the outlet. Is this an acceptible approach or is it a code violation?
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Pathfinder Tags: plenum
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TVP45
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Join Date: Jul 2007
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#1

Re: Technician

04/13/2008 6:07 AM

The question comes down to one about the combustion byproducts of the cable insulation.

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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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#2

Re: Technician

04/13/2008 7:18 AM

Hello Viking Bob

You will need to advise your location (Alter in your Profile), to get any accurate answer.

The reason is that Regulations vary in jurisdictions.

Kind Regards....

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Anonymous Poster
#3

Re: Technician

04/13/2008 11:49 PM

Just about all jurisdictions require that cables run in a plenum be specifically plenum rated. Plenum rated cables are marked as such. See NEC articles 300.22 and 645, particularly 645.5 (D) for more information on information technology situations. Std factory power cords are not normally plenum rated.
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CrossFire
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United States - Member - Northen Member Engineering Fields - Control Engineering - New Member Engineering Fields - Power Engineering - New Member

Join Date: Apr 2007
Location: CookInlet AK
Posts: 67
Good Answers: 2
#4
In reply to #3

Re: Technician

04/14/2008 12:53 AM

I had my NEC book open to that very artical before I scrolled down to see you had beat me to it.

Good Show.
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