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Chimney as a chase.
#198507
01/24/11 04:25 PM
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Joined: Jun 2007
Posts: 106
OP
Member
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Hi Guys. Anyone ever use an old chimney as a chase? I have a customer who wants receptacles above their fireplace which used to be a wood burning fireplace. It is no longer used as such but instead has an insert with a 4" exhaust up the existing chimney. I actually called the inspector and told him that the chimney is no longer used for exhausting a wood burning fireplace, therefore the temp will never get hot enough to do any damage. He was ok with it being used as a chase as long as I secured and maintained a distance between my BX and the 4" exhaust.
Anyone done this before?
Never trust an electrician with no eyebrows!!
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Re: Chimney as a chase.
[Re: mr_electrician]
#198519
01/25/11 09:51 AM
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Joined: May 2005
Posts: 984
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I've seen abandoned elevator and dumbwaiter hoistways used as chases...I don't see any real differences with your old chimney. Securing the raceway may be a bit tricky due to the small size of the chimney, but it certainly sounds like it would work.
Ghost307
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Re: Chimney as a chase.
[Re: ghost307]
#198522
01/25/11 05:56 PM
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Joined: Jan 2011
Posts: 64
Member
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What if someone wanted their fireplace back? Just to be the devil's advocate, is a chimmney approved and listed as a chase? Is mc approved and listed for in chimmneys?
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Re: Chimney as a chase.
[Re: PAteenlectrician]
#198527
01/26/11 12:05 AM
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Joined: Jul 2002
Posts: 8,379
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My first question would be, how old is the chimney? Reason I ask this is that boring holes in a brick chimney could weaken the structure of the chimney itself.
I have to agree with the comment of ghost about the cable being un-supported on a vertical run, you can't merely have a cable hanging in mid-air.
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Re: Chimney as a chase.
[Re: Trumpy]
#198533
01/26/11 12:39 AM
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Joined: Feb 2003
Posts: 939
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I have other question to ask ya for the 4 inch insterst what class pipe you are seeing it ? if class A forget it it will get more than just warm engouh to get the cable get soft and can cause short circuit.
Class B is iffy question depending on how big the fireplace burner is.
Really I am not too crazy to leave it hanging loose in the chimeny area especally too close to the pipe.
Merci. Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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Re: Chimney as a chase.
[Re: Trumpy]
#198534
01/26/11 12:41 AM
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Joined: Aug 2007
Posts: 853
Member
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My first question would be, how old is the chimney? Reason I ask this is that boring holes in a brick chimney could weaken the structure of the chimney itself.
I have to agree with the comment of ghost about the cable being un-supported on a vertical run, you can't merely have a cable hanging in mid-air.
#1) Structural concerns are for real. But with out a permit,a warranted consideration? (from an official stand point) #2) Aren't all 'snaked' in old work cables 'unsupported'? Balloon construction etc. #3) My main concern, Personally,Is that flue liner double insulated? 3A) For the reason I can not assure 4" of clearance the whole way.
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Re: Chimney as a chase.
[Re: Trumpy]
#198539
01/26/11 10:19 AM
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Joined: Jun 2007
Posts: 106
OP
Member
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My first question would be, how old is the chimney? Reason I ask this is that boring holes in a brick chimney could weaken the structure of the chimney itself.
I have to agree with the comment of ghost about the cable being un-supported on a vertical run, you can't merely have a cable hanging in mid-air.
Regardless of age is there really a concern with structural integrity if there is a 1/2" hole drilled into it? To clarify other comments/suggestions the 4" duct going up the chimney is in a space that is about 8"wide. The BX is only loose in the chimney for about 24" and the rest is straped. If the home owner ever wanted a wood burning fireplace again I guess he would have to remove the BX and fix the holes and liners he drilled trough. Remember I did ask my local inspector if it was acceptable and he had no issues with it. Personally I don't like it but thats what the customer wanted and it was accepted by inspection.
Never trust an electrician with no eyebrows!!
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Re: Chimney as a chase.
[Re: mr_electrician]
#199446
02/26/11 09:17 AM
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Joined: Feb 2011
Posts: 7
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Don't cross trades.Today you run cable in old chimney,tomorrow in old sewer line? Cut walls.If owner have to many questions call Electrical Inspector-he will help you.
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