A metal clad FCU won't offer fire resistance.
The integrity of the mains supply to the system is also regarded as essential, even though the system has a standby supply. Accordingly, mains supply circuits need to be adequately protected against the effects of fire.
As stated in 25.2h) wherever possible the circuit supplying a fire alarm system need not be protected by an RCD. The 17th Edition of the IEE Wiring Regulations (BS 7671:2008) introduces a number of new
requirements for the installation of RCDs. Regulations 522.6.6; 522.6.7; and 522.6.8 concern cables concealed in walls or partitions.
Reference should be made to these regulations when considering which cable type will be used for the mains supply for the fire alarm system, as not all cable types that meet the requirements to be classified as “standard fire resisting cables” or “enhanced fire resisting cables” in BS 5839-1 will provide an adequate level of mechanical protection to satisfy the requirements of 522.6 in BS 7671. It should be noted that the requirements for mechanical protection in 522.6 are specifically aimed at the issue of penetration of concealed cables by nails, screws and the like.
Consideration could also be given to running cables supplying fire alarm systems on the surface in some cases.
This supply should be regarded as an integral part of the fire alarm system, particularly for the purpose of certification of the system (see Clause 41), regardless of whether the electrical installation within the building is provided by the organization responsible for installation of the fire alarm system.
Wouldn't it be important for the 240 v supply to be in fp or pyro etc in case of battery failure?
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