Now it gets a little deeper. I thought you were just asking a general question, but now it seems you are involved somehow in an installation. So my question is- is this for residential (your own) or a commercial job?
If it's your own house you may be able to get away with installing your own system (depending on local regulations) but you may have a problem finding a company to monitor it.
If this is for a customer especially a commercial building I can tell from your attitude that it's not your job.
-Hal
