Hey guys!
In my 18 years in the trade, I have yet to need to come to a forum to ask for help, but the time has come.
We are building a multifamily project with two sub-levels of garage with 5-stories of wood structure above. Basically, the two main electrical rooms that feed everything are in the basement below Level 1. I have chase/leave-out locations in the Level 1 slab above these two main electrical rooms with the plans of running SER from the equipment, through the leave-outs in the slab, then through the 5-story wood-framed structure to feed house panels and meter centers throughout.
My issue is that there is a 3-hour firewall separating one of the sections. I have approval from the city to penetrate the firewall with electrical cable, as long as we use the correct fire device/assembly/method. Most of the SER will be 250 KCM 3-Phase Aluminum. I am familiar with 2-hour penetrations in walls and floors, but I reached out to our firestopping rep, and he said it would be "an engineering decision" regarding the 3-hour penetration.
This is beyond anything I'm capable of figuring out on my own at this time, I dont understand the UL systems, etc, so if you can help me, I'll do my best to help you with a little consultation reward, haha. I'm desperate at this point.
Thank you in advance
In my 18 years in the trade, I have yet to need to come to a forum to ask for help, but the time has come.
We are building a multifamily project with two sub-levels of garage with 5-stories of wood structure above. Basically, the two main electrical rooms that feed everything are in the basement below Level 1. I have chase/leave-out locations in the Level 1 slab above these two main electrical rooms with the plans of running SER from the equipment, through the leave-outs in the slab, then through the 5-story wood-framed structure to feed house panels and meter centers throughout.
My issue is that there is a 3-hour firewall separating one of the sections. I have approval from the city to penetrate the firewall with electrical cable, as long as we use the correct fire device/assembly/method. Most of the SER will be 250 KCM 3-Phase Aluminum. I am familiar with 2-hour penetrations in walls and floors, but I reached out to our firestopping rep, and he said it would be "an engineering decision" regarding the 3-hour penetration.
This is beyond anything I'm capable of figuring out on my own at this time, I dont understand the UL systems, etc, so if you can help me, I'll do my best to help you with a little consultation reward, haha. I'm desperate at this point.
Thank you in advance
