Sleeves

[Alwayslearningelec]

Sure Infinity would be aware of this situation , IUn annew construction job and these conduits and cables going up 3-4 floors would you HAVE to put sleeves in of would you get your conduits in before theslab pour? Which is more likely? Thanks

 

[Rick 0920]

There are several ways to accomplish this. Personally, if I have as much as shown in the graph above, I would create a blockout before the slab pour and then firecaulk or fill with other approved means after all my conduits and cables were installed. Core drilling is also another option. It doesnt take as long as some people think to set up and core holes. Precise cutting after the pour can make installations easier and with fewer bends. Also take into account if your vertical runs are straight, you will need strain reliefs for your conductors and cables.

 

[Alwayslearningelec]

There are several ways to accomplish this. Personally, if I have as much as shown in the graph above, I would create a blockout before the slab pour and then firecaulk or fill with other approved means after all my conduits and cables were installed. Core drilling is also another option. It doesnt take as long as some people think to set up and core holes. Precise cutting after the pour can make installations easier and with fewer bends. Also take into account if your vertical runs are straight, you will need strain reliefs for your conductors and cables.

Thanks. Why not just get the strut framing shown and conduits in before the pour?

 

[ptonsparky]

I've never done anything of that scale. maybe change orders?

Thanks. Why not just get the strut framing shown and conduits in before the pour?

 

[Strathead]

There are several ways to accomplish this. Personally, if I have as much as shown in the graph above, I would create a blockout before the slab pour and then firecaulk or fill with other approved means after all my conduits and cables were installed. Core drilling is also another option. It doesnt take as long as some people think to set up and core holes. Precise cutting after the pour can make installations easier and with fewer bends. Also take into account if your vertical runs are straight, you will need strain reliefs for your conductors and cables.

100% I would do this. Block out the floor for this many conduits. Then I would contact your preferred firestopping manufacturer and find the best sealing solution. My first instinct is Fire Blocks such as what Hilti has. Much less work than sleeves for every item. Check out Fire Block Hilti on Google, or better yet call their 800 number and talk to a specialist.

 

[Rick 0920]

Thanks. Why not just get the strut framing shown and conduits in before the pour?

That would be a great way to do it. The job schedule won't always give you the time to do this plus you're using a lot of material.

 

[infinity]

If you can run the conduits before the pour. That eliminates all the costs associated with firestopping.

 

[Rick 0920]

If you can run the conduits before the pour. That eliminates all the costs associated with firestopping.

I still think a blockout would be best in this instance. Minimal sealing would be needed if you just used a hole saw on the floor decking, then you can just mix up some concrete and fill the blockout after sealing around the holes.

 

[Alwayslearningelec]

If you can run the conduits before the pour. That eliminates all the costs associated with firestopping.

If you lay down the strut as shown in the pic then that eliminates the ability for the concrete to be poured around the conduits?

 

[infinity]

If you lay down the strut as shown in the pic then that eliminates the ability for the concrete to be poured around the conduits?

What is the reason for all of the extra length of 3" strut is it spanning an opening?

 

[Strathead]

If you can run the conduits before the pour. That eliminates all the costs associated with firestopping.

You would still need to sleeve things like the MC

 

[infinity]

You would still need to sleeve things like the MC

True, he did ask specifically about running the conduit before the pour which is preferable if you're paying for firestop.

 

[Alwayslearningelec]

What is the reason for all of the extra length of 3" strut is it spanning an opening?

IDK. Designed by an electrical subcontractor engineer.