I don’t have much info to hand at the moment, so it’s more a question & answer session, well questions anyway, you’ll need to give the answers HC! ;) What are the cables actually “doing”? If you cut through the cables would it affect the fire alarm system? In the event of a fire if the cables burnt through, would this affect the alarm? Are they pvc/pvc, or are they FP200 type? (FP200 is a trade name, other cables of this type are available). When do these systems originate from? What did the standards for the fire alarm say were the requirements when the alarm system was desgined. What does BS5839 say now about what the requirements are? IF the cable integrity can compromise the alarm, what does your FRA say about it? What has changed? Are the contractors you use competent to assess the system? Not the “company” but the actual people “doing” the work, there is a difference. What are the reasons given for the “fail” surely they must justify their decision with quotes from standards or guidance or the like? What does accepted industry guidance say about the situation you describe? I stay as far away from Fire Alarms as I can TBH, one has to draw limits somewhere, however, I do have some knowledge & experience.