MC cable firestopping UL interpretation

Strathead said:
But they aren't. Hilti and Spec Seal are the best in my experience. Not to discount any others. Just I have had personal experience with both of these and they were as helpful as one could expect.
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And I had better luck through 3M
 
Strathead said:
Don't email call Hilti. 1-800-879-8000 I promise they won't disappoint.

To answer your question. because just like the code, it means what it says. In this case "any combination" is not one cable. Firestopping has become very precise in the last 20 years.
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called them, they said i needed to submit an engineering judgment request for firestopping.
 
Tainted said:
called them, they said i needed to submit an engineering judgment request for firestopping.
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After seeing this I did a few minutes searching Specseal's systems. This isn't difinitive, but every system had a maximum 2/0 MC cable size. I speculate that UL has not done an assembly with larger cable. Due to that, you will need to do what Hilti said. It isn't that difficult and it usually takes about a week. It was a free service the last time I did it.
 
Strathead said:
After seeing this I did a few minutes searching Specseal's systems. This isn't difinitive, but every system had a maximum 2/0 MC cable size. I speculate that UL has not done an assembly with larger cable. Due to that, you will need to do what Hilti said. It isn't that difficult and it usually takes about a week. It was a free service the last time I did it.
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I see, waiting on their reply right now.. Can you show me that 2/0 detail?
 
For my designs I do not put any firestopping details on my drawings. The "details" are all in my spec's. Basically I tell the contractors that they must firestop per UL. I also request submittal data on the fire stop they will be using. I have found that over the years, the UL details change so much that by the time I use them they are outdated. Also, the main fire stopping material manufacturers also have specific details that need to be used.
 
For my designs I do not put any firestopping details on my drawings. The "details" are all in my spec's. Basically I tell the contractors that they must firestop per UL. I also request submittal data on the fire stop they will be using. I have found that over the years, the UL details change so much that by the time I use them they are outdated. Also, the main fire stopping material manufacturers also have specific details that need to be used.

I am also in Florida. I have observed that almost all fair sized project have firestopping assemblies on the plans. They are usually (want to say always) by the Architect not the engineer. I have assumed that they are required by the Plan reviewers since they are always there.
 
Strathead said:
Don't email call Hilti. 1-800-879-8000 I promise they won't disappoint.
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I agree with you about calling them. Some people are just plain afraid of the telephone anymore, don't seem to remember how to use them :cool: . It's amazing what you can get done on the phone speaking to someone sometimes instead of a 'Google' search if you can get a human on the phone right away. :)
 
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