Running conduit under trench

[DingD]

Hi guys,

I have some very strong electrical conduit (made out of Polyethylene) which I plan to run under the trench (not through it) before pouring the concrete. However, I was thinking about the weight of the foundations and the building and the possibility of crushing the conduit.

Am I being reasonable here ? I could run it through the trench but then I don't want to weaken it (the conduit has a diameter of about 44mm and I'll be making two runs).

Also, when pouring concrete for the treach, what type of concrete should I specify to the ready-mix guys? It's going to be a pretty big single wall garage.

 

[John D v2.0]

The foundations weigh a large amount but the eight is spread over an equally large area, so you'll be fine.

 

[John D v2.0]

Although there wouldn't be any strength problem running it through the foundations, unless you're building a block of flats!

 

[tomfe]

Just a gen 1 for foundations.

 

[DingD]

Thanks Guys. I will go ahead with the conduit work then

Just a gen 1 for foundations.

Ah, I was going to get gen 2 or 3. Any reason I should stick to gen 1 instead ?

 

[r896neo]

Its cheaper. No need for the extra cement in a footing.

 

[^woody^]

Services are not run under trenches. That's just stupid.

Run it next to the trench. ie in the side.

 

[DingD]

Services are not run under trenches. That's just stupid.

Run it next to the trench. ie in the side.

I'm not running the entire stretch under the trench, just the last half metre. That way I can run wiring directly through the floor slab. Still stupid?