On Friday, March 25, 2016 at 11:32:08 AM UTC-4, trader_4 wrote:
If the interconnect wire is broken, the alarms still work individually.


No. This is where you are 100% wrong.

Well, you are right from the common sense view.

But not from the regulatory view. You build a safety system that was better than required, but then you were required to have it completely functional. You are better off to not have it at all than to have it and not have it work exactly as designed. That may not make sense but that's the way code works.