120v safety circuit - in series w/ motor starter?

[Loco1234]

Im trying to determine/locate the portion of code that calls for safetys to be in the 120v starter circuit. For ex:
An Air handler has many safetys. it has been my understanding that most of these safetys have to be wired in series w/ the 120v starter circuit going to the overloads. that utilizing the controls system to shutdown the AHU on many of these safetys is not good enough & simply wouldn't work if the AHU were to be running in HAND mode.(unless they were in series w/ the motor starter)
My research has found the following:
NFPA 70 (NEC 2008) describes a safety device in series with a boiler being shown in series w/ the 120w power. (725.31) & (Exhibit 725.3)

There is also mention in the NEC under 430.74 which I believe to be relevant. These are pictured in exhibit(s) 430.14 & 430.15

It is my understanding that AHU saftey's such as fire/smoke detectors, high pressure switches, freezestats, etc... should all be wired in series with the fan motor(s). utilizing soley the controls systems to stop sending a run signal to the AHU is not enough.

Thoughts...? Opionions...? ANy further sugestions... I have looked through the NFPA 90A, NFPA91, & the NFPA 101 (life safety code)

 

[barbeer]

I have never heard control side is not good enough for shutdown.

 

[benaround]

I have never heard control side is not good enough for shutdown.

The trouble with using the control side is ; for example, you want to shut down the fan in

the AHU, if you open the line side of the control power, the fan will shut off, if you use the

control side it will shut off in a minute or two. That minute or two may be fueling a fire and

someone's life may be in danger because of it.