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#TechnicalThursday In today's technical corner, we are having a closer look at the Part B of the Building Regulations. ⚡ Many Electrical Engineers may not be aware that Part B of the Building Regulations - Fire Safety in Buildings other than Dwellings, has a dedicated subsection regarding requirements for lighting diffusers. This applies to where a lighting diffuser is made from a thermoplastic and the fitting is recessed and the diffuser forms part of a suspended ceiling. The reason behind this is because ceilings are tested to determine how quick a fire can spread across them, whereas installing thermoplastic lighting diffusers introduces a potential weak point on the ceiling where fire can potentially spread quicker. 💡 Part B states thermoplastic lighting diffusers should not be used in fire-protecting suspended ceilings or fire-resisting ceilings unless they have been satisfactorily tested as part of the ceiling system that is to be used to provide the appropriate fire protection. It also restricts the use of thermoplastic diffusers that form part of the ceiling in protected stairways. 🚨 Apart from the above, there are no restrictions on TP(a) rated diffusers. However, TP(b) rated luminaire diffusers do have restrictions and the limits on their usage can be found in the extracts below from section 2.3.3 of Part B of the Building Regulations. When doing lighting designs and specifications engineers should always be aware of the TP rating of the diffusers for recessed fittings and ensure the design is compliant with Part B. #MEPdesign #electrical #TechCorner #AxisengExpertise Gavin Wilde

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