Have you installed fire alarm before? I'm not familiar with the codes that apply where you're located; where I work 3/4" EMT is the minimum size that can be utilized, and I wouldn't have it any other way. Do your spec's call for class A or class B wiring (I know, old terminology, but I'm old). This is what will determine how to run your conduit. Have you asked why you weren't provided with a riser diagram? You're field engineering this without one, making me wonder if this job has been through a permit application and AHJ plan check. I'm inferring that your prints aren't showing conduit paths or wire counts. Do you have battery & voltage drop calculations? Is a NAC booster power supply part of the install? Fan shutdown, fire/smoke damper & fire/smoke door closure, and elevator recall details?
Regarding their smokes, I've found that the SIGA-SB bases are easier to install on octagon boxes than the boxes the factory calls out for on the installation instructions. Personally, I'm not fond of their relay bases, and prefer to use discrete (SIGA-CR) relays. I would recommend installing isolator bases or modules. Also, avoid using cut-in boxes for pull stations. Just not enough room for the guts of the module and the wire. If you're mounting several SIGA-CR control relays in 4" square boxes with single gang rings, don't butt the boxes up against one another, since the cover plates are taller than 4".
Is the sprinkler equipment you're monitoring indoors or outside?
Do you have a copy of the manufacturer's wiring practices manual? It may not be in the document package you were furnished, but should be available from whoever is supplying (and likely programming) the QS4 panel.
