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#198507 - 01/24/11 01:25 PM Chimney as a chase.
mr_electrician Offline
Member
Registered: 06/22/07
Posts: 106
Loc: London, Ontario
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?
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#198519 - 01/25/11 06:51 AM Re: Chimney as a chase. [Re: mr_electrician]
ghost307 Offline
Member
Registered: 05/09/05
Posts: 900
Loc: Chicago Illinois USA
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.
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#198522 - 01/25/11 02:56 PM Re: Chimney as a chase. [Re: ghost307]
PAteenlectrician Offline
Member
Registered: 01/06/11
Posts: 64
Loc: Cressona, Pa, U.S.A. (Schuylki...
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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#198527 - 01/25/11 09:05 PM Re: Chimney as a chase. [Re: PAteenlectrician]
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: SI,New Zealand
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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#198533 - 01/25/11 09:39 PM Re: Chimney as a chase. [Re: Trumpy]
frenchelectrican Offline
Member
Registered: 02/06/03
Posts: 939
Loc: Wi/ Paris France { France for ...
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
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#198534 - 01/25/11 09:41 PM Re: Chimney as a chase. [Re: Trumpy]
leland Offline
Member
Registered: 08/20/07
Posts: 853
Loc: Lowell area, Ma. USA
Originally Posted By Trumpy
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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#198539 - 01/26/11 07:19 AM Re: Chimney as a chase. [Re: Trumpy]
mr_electrician Offline
Member
Registered: 06/22/07
Posts: 106
Loc: London, Ontario
Originally Posted By Trumpy
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.
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#199446 - 02/26/11 06:17 AM Re: Chimney as a chase. [Re: mr_electrician]
andrey Offline
New Member
Registered: 02/25/11
Posts: 7
Loc: canada,nb
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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