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#85376 - 06/25/03 06:03 AM Fence as support ?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Would it be acceptable to secure a PVC conduit run to the bottom of a chain link fence? Huge roots & rock would impede digging a trench.
Has anyone ever used a fence as a support structure?
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#85377 - 06/25/03 08:24 AM Re: Fence as support ?
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
Redsy,
I've seen fences used for conduit support. It works well with metallic conduit, but the spacing of the fence posts is normally too far apart for PVC conduit where supports are required every 3' for 1" and smaller and every 5' for 1 1/4" through 2". You will also need to install expansion joints if the calculated change in lenght is over 1/4". An outside run of PVC here in Illinois that is exposed to direct sunlight will may require two expansion fittings every 100'.
Don
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#85378 - 06/25/03 08:27 AM Re: Fence as support ?
GEO Offline
Member
Registered: 03/12/03
Posts: 47
Loc: Lancaster,Pa
have used top of chain link fence, by running conduit,this was coated to match fence(green)worked well and is still in existance. GEO
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#85379 - 06/25/03 08:53 AM Re: Fence as support ?
Bill Addiss Offline
Member
Registered: 10/07/00
Posts: 3875
Loc: NY, USA
I think strapping conduit near the bottom of a chain link fence would be putting the conduit where it could very likely be damaged by people stepping on it.

For argument's sake could pressure treated 4x4s or RR Ties be considered as support laid on the ground between posts? (the conduit would be strapped to it at appropriate intervals and to the posts) It would help protect the conduit in the spans between posts. Would that be acceptable to everyone?

Bill

[This message has been edited by Bill Addiss (edited 06-25-2003).]
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#85380 - 06/25/03 09:00 AM Re: Fence as support ?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Don, GEO thanks for your input.

The pipe would be installed at ground level, so "support" per se, is not an issue.
I'm also interested in attachment method to the fence, which would actually be used to "fasten" the conduit in order to keep it from moving.
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#85381 - 06/26/03 01:36 PM Re: Fence as support ?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Bill,
Didn't mean to slight you by omitting your name. You must have been posting while I was writing.
I am considering the PT 4x4s. I guess they would need to be anchored w/ rebar spikes.
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#85382 - 06/26/03 02:12 PM Re: Fence as support ?
Bill Addiss Offline
Member
Registered: 10/07/00
Posts: 3875
Loc: NY, USA
Redsy,

No problem here. That happens to me a lot because sometimes it may take me 20 min to get a post up for whatever reason.

If the 4x4 thing sounds good maybe you could staple the chain link to them (4x4s) with Galvanized staples?

Do our Inspectors have any comment on that?

Bill

[This message has been edited by Bill Addiss (edited 06-26-2003).]
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#85383 - 06/27/03 04:53 AM Re: Fence as support ?
Redsy Offline
Member
Registered: 03/28/01
Posts: 2056
Loc: Bucks County PA
Our traffic lighting, and highway sign conduits are usually fastened to the main support pole with metal banding.
As far as attaching to the bottom of the fence, would UV resistant ty-raps be acceptable.
Can 110.3 be cited in either or both cases described above?
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#85384 - 06/27/03 05:12 AM Re: Fence as support ?
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: West-Southern Inner-Northeast ...
Redsy — Might you be able to use Aerosol/"worm" clamps to secure the raceway? They seem fairly corrosion resistant and not too pricey.
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#85385 - 06/28/03 02:08 PM Re: Fence as support ?
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2148
Loc: IL
For the expansion joint(s) to work, whatever type of fastening that is used must allow lengthwise movement of the PVC.
Don
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Don(resqcapt19)
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