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Joined: Oct 2000
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Wire in Air Return Duct - Or- is it the other way around? In this older building, currently being restored, the HVAC guy "made a duct" by sealing a joist bay with a sheet of metal. In this pic, you are looking into the opening where the return air grille sets. Please note the K & T wire mounted inside this duct.
- renosteinke
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Joined: Dec 2004
Posts: 329
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Efficient utilization of space?
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Joined: Mar 2005
Posts: 1,803
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Nice figured timber. Oak?
Alan
Wood work but can't!
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Joined: Dec 2001
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Would guesss so, especially the first pic really looks like oak. Badly butchered around the hole though!
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Joined: Nov 2001
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I THING THIS WAS A STANDARD PRACTICE FOR HVAC BACK IN THE DAY. BUT CHOOSING A BAY WHERE KNOB+TOBE WIRING IS LOCATED IS JUST PLAIN STUPID....
JBIELECTRIC EAST MEADOW NY
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Joined: Jun 2005
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Now why on earth would someone NOT USE an electrician here is beyond me. I hate when those outlets are on the molding like that cus' I know some BS wiring like this can't be too far away. I would guess the wiring was there before the duct was. Really no excuse for this kind of work.
Brutal, just brutal.
[This message has been edited by ShockMe77 (edited 09-14-2005).]
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Joined: Jan 2005
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Let's get out our codebooks and see what the NEC has to say....anyone?
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Joined: May 2003
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Wiring K&T inside a plenum isn't in the Not permited section? (394.12) Its not hip in my mind, but may be allowed?
I figure the wiring came first, but who knows, it was 40-80 years ago.
As for base board mounted recepticals, I do it all the time (matching existing and new.), many prefer it.
Mark Heller "Well - I oughta....." -Jackie Gleason
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Joined: Feb 2004
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Speaking of the baseboard recept, My father in law has a house that was built sometime in the late 1800's (I found an "afterthought" fusible switch that was tied into somekind of K&T "loop" in the attic that was dated 1905) and the walls aren't thick (deep) enough to fit a standard depth cut in box inside, unless you place it in the baseboard were it adds some extra depth....
-Randy
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Joined: Jan 2005
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300.22 discusses wiring methods permitted in ducts. K & T isn't one of the permitted methods. That aside, this duct was certainly made after the wire was in place, and well after the building was first put up. The resulting violation is probably due to ignorance on the part of the installer.
The short version: wiring inside ducts has to be in a metal conduit of some sort, or be miner-insulated cable.
I have often seen wires pass through ducts- form side to side- but this is the first time I've seen the wires running lengthwise within the duct.
I am told, by my friends in the HVAC community, that such "made" ducts have prooven to be rather poor ducts, and that the practice of making a duct by closing off a joist bay is abvoided by better contractors. It may (I don't really know) also violate some of the newer energy codes.
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Tom
Shinnston, WV USA
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Joined: January 2001
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