Post B5DphxIM2rVoTUDbN2 by azonenberg@ioc.exchange
 (DIR) More posts by azonenberg@ioc.exchange
 (DIR) Post #B5CuWtJ6pwMpXA9fUW by azonenberg@ioc.exchange
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       Firestopping on cable tray penetrations between my lab and house (cc:  @whitequark )
       
 (DIR) Post #B5CxpmA7vQ5AjseMbo by arclight@oldbytes.space
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       @azonenberg @whitequark You should never be allowed near a nuclear plant. :)Aside: I've seen the results of arcing within the potting compound of a cable penetration from a power plant. Safety analysis is weird.
       
 (DIR) Post #B5CxpmNx618pQl7P9s by azonenberg@ioc.exchange
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       @arclight @whitequark I only had to pass residential building code and this was more than enough to make the inspector happy, lol.(this is also only 120VAC not anything crazy)
       
 (DIR) Post #B5D28JGtxpMqSFubui by waldi@chaos.social
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       @azonenberg @whitequark Those steel pipes look like ideal circuits for stuff to travel through. Here we like plastic tubes for this use case and they require special handling for fire proofing.
       
 (DIR) Post #B5D2F0cBj9yqcS3yD2 by azonenberg@ioc.exchange
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       @waldi @whitequark That isn't conduit it's actually a premade cable with hot, neutral, and ground conductor inside a plastic strain relief wrap inside a flexible spiral metal armor.Flex conduit of a similar construction exists but is larger.
       
 (DIR) Post #B5D3BJ3RKN9ebWblR2 by lambda@chaosfurs.social
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       @azonenberg @whitequark huh, you just stuff those pillows in there and caulk up the gaps? I don't think that's allowed here - at least I've never seen it for residential/normal business buildings, it's always fully filled up with white firestop compound.
       
 (DIR) Post #B5D3nY0w9kxY0MfkDA by azonenberg@ioc.exchange
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       @lambda @whitequark Yeah the pillows are great for cable tray configurations that you modify frequently because you don't need caulk between them (only in small voids around the bottom of the tray where the caulk can't reach). Which makes it super easy to open things up and add more cables or something.See https://www.3m.com/3M/en_US/p/d/b40070037/ (not the exact part i used but similar)
       
 (DIR) Post #B5Dphx6Ilfs3s6ZyaG by zop@7td.org
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       @lambda @azonenberg @whitequark If they’re actually fire stop pillows they’ll char and expand when exposed to flame. Sealing up tight. Until they’re exposed to fire though, they can’t be relied upon to keep smoke from propagating between spaces.
       
 (DIR) Post #B5DphxIM2rVoTUDbN2 by azonenberg@ioc.exchange
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       @zop @lambda @whitequark yeah the caulk and mineral wool in the bottom area helps make it more airtight while still having pillow to pillow joints you can easily remove to add wires
       
 (DIR) Post #B5DqK4xryhm1GWoce8 by zop@7td.org
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       @azonenberg @lambda @whitequark Exactly. I’ve used them a lot in cable trays or larger openings any time there was a chance we’d be in and out of them in the future, or just when there was larger gaps I didn’t want to make sheet metal filler plates for. Do it decent it’ll pass fire inspection anger…except Chicago lol (Chicago made me build sheet metal AND pack pillows AND caulk to make one inspector happy)
       
 (DIR) Post #B5DqK5N2T7uGWaaisS by azonenberg@ioc.exchange
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       @zop @lambda @whitequark oh this wouldn't pass in Chicago their codes are crazy I'd have to run all of my wiring in EMT instead of using MC