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#107457 - 09/22/04 08:15 AM Buried in Concrete  
Admin  Offline

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Joined: Oct 2000
Posts: 3,447
NY, USA
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]


2017 / 2014 NEC & Related Books and Study Guides

#107458 - 09/22/04 09:05 AM Re: Buried in Concrete  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,217
SI,New Zealand
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]


Let's face it, these days if you're not young, you're old - Red Green grin

#107459 - 09/22/04 10:49 AM Re: Buried in Concrete  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
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)

#107460 - 09/22/04 11:41 AM Re: Buried in Concrete  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,217
SI,New Zealand
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.


Let's face it, these days if you're not young, you're old - Red Green grin

#107461 - 09/22/04 01:27 PM Re: Buried in Concrete  
resqcapt19  Offline
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Posts: 2,148
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Thanks Mike.
Don


Don(resqcapt19)

#107462 - 09/23/04 06:00 AM Re: Buried in Concrete  
Big Jim  Offline
Member
Joined: Jul 2003
Posts: 394
Denver, CO USA
Nice custom in-use cover also!


#107463 - 09/23/04 01:11 PM Re: Buried in Concrete  
GETELECTRIC  Offline
Member
Joined: Oct 2003
Posts: 172
toronto canada
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.


#107464 - 09/23/04 03:50 PM Re: Buried in Concrete  
Texas_Ranger  Offline
Member
Joined: Dec 2001
Posts: 2,399
Vienna, Austria
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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