Like luckyshadow points out,make sure that the Fire Marshall is happy. I do most of my work in Virginia, but do some work in Maryland and DC. Be careful when working off drawings that have not been approved. An electrical engineer does not need a NICET certification for electrical permit drawings (if I am not mistaken), however what you send for approval to Fire and Rescue does require a NICET Level 5 just to be seen.
The drawings WILL CHANGE! A/V's will move and change candella ratings. Initiation devices will be added/deleted. If conduit is not specified for the entire system you might want to look at pulling FPL, FPLP, or FAMC instead of hard pipe, as this gives you the flexibility to easily set a box if something has to move, and cutting in an old work in the wall for changes.
Also, try to find the class of wiring that you need. If you are doing a Class A system, you can not t-tap and you have to pull a complete loop from the FACP back to the FACP. If it is a class B system you have more room for error with the initiating loop. You only have one home run, and not two. Make sure that the signal loop is in series! If not, it will not work. Data (depending on class can be in parallel), but signal must be in series.
As my last little bit, what is it going to cost you to install the system and what will it cost to sub it out? There is a fine line there. If you have green help pull the cable and they do it correctly what will it cost for the device install and programming? If you have green help pull and they F-up, what will it cost to troubleshoot and repair? Good luck!
