Fire resistance rating requirements for electrical distribution boxes

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Level of interior fire protection, fire resistance duration of at least 30/90 min. With the introduction of the 15th Edition of the IEE Wiring Regulations in 1981 the UK aligned the requirements of the regulations with the International Electrotechnical Commission (IEC) worldwide electrical installation standard IEC 60364. UL evaluates both metallic and nonmetallic outlet and switch boxes for use in fire-resistant rated assemblies, and provides guidance for proper installation in the associated product category guide information pages. One way to prevent boxes from reducing the wall's fire rating and thus meet the IBC performance requirement is by using putty pads or other tested and Certified1 materials.

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