OK,
Do FA systems in your area require a "qualified person" to do the installation?
I'm not being smart here, but some jurisdictions do require that a technician that is qualified in FA systems, period.
If you aren't, get someone that is.
Byron, by the sound of this thread, you are out of your depth, Life Safety systems like fire alarms are not something to be mucked around with.
I really can't give advice, as your understanding of relays and contactors seems to be lacking.
As simple as this would be to do, I'm not going to give advice as the execution could endanger lives.
One word- LIABILITY.
