ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Al Hildenbrand - Minneapolis - obituary
by Bill Addiss - 02/03/23 07:38 PM
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 23 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#118497 09/22/04 07:15 AM
Joined: Oct 2000
Posts: 3,672
Likes: 2
Admin Offline OP
Administrator
Member
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]

#118498 09/22/04 08:05 AM
Joined: Jul 2002
Posts: 8,432
Likes: 3
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]

#118499 09/22/04 09:49 AM
Joined: Nov 2000
Posts: 2,148
R
Member
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)
#118500 09/22/04 10:41 AM
Joined: Jul 2002
Posts: 8,432
Likes: 3
Member
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.

#118501 09/22/04 12:27 PM
Joined: Nov 2000
Posts: 2,148
R
Member
Thanks Mike.
Don


Don(resqcapt19)
#118502 09/23/04 05:00 AM
Joined: Jul 2003
Posts: 394
B
Member
Nice custom in-use cover also!

#118503 09/23/04 12:11 PM
Joined: Oct 2003
Posts: 172
G
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.

#118504 09/23/04 02:50 PM
Joined: Dec 2001
Posts: 2,498
T
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.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Radar
Radar
Los Angeles
Posts: 349
Joined: April 2004
Top Posters(30 Days)
BigB 4
triple 3
Popular Topics(Views)
303,132 Are you busy
232,155 Re: Forum
216,884 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5