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Buried in Concrete #118497 09/22/04 08:15 AM
Joined: Oct 2000
Posts: 3,631
Admin Offline OP
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Quote
Thought you might get a kick out of this one. I'm doubtful that the Canadian code allows for wire to be buried in concrete, sans conduit, especially in a very very damp location (Vancouver, Canada).

- Derek L.
[Linked Image]

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Re: Buried in Concrete #118498 09/22/04 09:05 AM
Joined: Jul 2002
Posts: 8,337
Trumpy Offline
Member
Good Lord!.
It makes you wonder what the rest of the cable looks like, inside the concrete.
The chemicals in concrete aren't usually that kind to PVC. [Linked Image]

Re: Buried in Concrete #118499 09/22/04 10:49 AM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
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Mike,
Quote
The chemicals in concrete aren't usually that kind to PVC.
I've never heard that before. The most common underground installation in my area is concrete encased PVC conduit.
Don


Don(resqcapt19)
Re: Buried in Concrete #118500 09/22/04 11:41 AM
Joined: Jul 2002
Posts: 8,337
Trumpy Offline
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Don,
The type of PVC that is used for rigid conduit, is an un-plasticised version of Poly-Vinyl-Chloride.
The type used for wires and cables has a plasticiser added to it, to make it more flexible.
It is this plasticiser, that the acidic content of the concrete reacts with.
There are also forms of plasticiser that react with sunlight too and some overhead lines here have been known to lose thier insulation.

Re: Buried in Concrete #118501 09/22/04 01:27 PM
Joined: Nov 2000
Posts: 2,148
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resqcapt19 Offline
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Thanks Mike.
Don


Don(resqcapt19)
Re: Buried in Concrete #118502 09/23/04 06:00 AM
Joined: Jul 2003
Posts: 394
B
Big Jim Offline
Member
Nice custom in-use cover also!

Re: Buried in Concrete #118503 09/23/04 01:11 PM
Joined: Oct 2003
Posts: 172
G
GETELECTRIC Offline
Member
All the conduit is for in concrete is a raceway,if after the cement sets the conduit rots away or disintegrates no matter you have the channel and you must pull a ground.

Re: Buried in Concrete #118504 09/23/04 03:50 PM
Joined: Dec 2001
Posts: 2,486
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Texas_Ranger Offline
Member
A guy from germany once told me the Mexican way of resi wiring. Put a greased garden hose into the concrete walls while pouring them. After it's set pull out hose and reuse. Then pull THHN into the resulting cavity. No ground, just a jumper wire N-G at every receptacle.


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