Selection and sizing of conductors supplying electrical equipment that must remain functional during a fire – study

20.01.2011 

Cables that are exposed to fire while being expected to retain their functionality and provide power to essential equipment at another location must be appropriately selected and sized to take account of the increased electrical resistance at elevated temperature.

Cables, including fire safety cables, are specified in terms that reflect their normal duty conditions; design parameters under fire conditions are rarely, if ever, specified. The objective of this study is to provide a clear methodology for designing fire safety circuits based on the derivation and application of correction factors and standard cable parameters.

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